Related
This has me stumped. The user is able to work with workbooks containing the same code that were produced previously. Just recently new workbooks with the same code in them cannot be opened or saved. There are a range of error messages depending on where the workbook is opened from - we have tried safe locations, local folders and Dropbox folders. We have also tried with code signed and unsigned workbooks.
Error messages include:
'Excel cannot open the file Test.xslm because the file format or extension is not valid...' (not true, as I can open the same workbook and run the code without problem).
'Your changes to Text.xlsm could not be saved due to a sharing violation...' (followed by more errors to do with not finding a temporary document).
I have also tried removing ActiveX references which might flag as a security issue, (e.g. VBIDE) and commenting out blocks of code. No joy. Microsoft Defender reports no issues. There are no other antivirus programs running. There are no problems with the same workbooks with the VBA modules removed completely - so it definitely looks code related.
Anyone have any ideas?
This might be because of ASR.
If you check your "Windows Security" --> Virus & threat protection --> Protection history, you should find an event of "Risky action blocked" that shows your file has been "Blocked by: Attack surface reduction" Rule: Block Win32 API calls from Office macro".
I'm currently facing a very similar issue but I'm on the other side (I am the one that enabled ASR rules).
If that is the case for you as well, I wonder whether the problem depends on the identity that you use to save the file through your macro. Are you using the same security context of the user executing Excel?
I have created a custom class that adds references based on what the macros need to run on the particular Project or Excel file. This class works for both MS Project and Excel. The problem I am having is in the code how can I determine if the application is a Project or Excel file? Currently my code works by default assuming that it is in an Excel file, if an error occurs I handle the error by switching the code from "ActiveWorkbook" to "ActiveProject". Is there any way I can avoid using error handling and just run a check to see what I am in.
Thanks!
#Jeeped's comment points to a simple answer--test the Name property of the Application object. Not in the Immediate window, of course, but in an If statement: If Application.Name = "Microsoft Excel" Then....
I have some Excel worksheets that use ActiveX checkboxes to control certain activity. They worked recently but today started to give errors. I was alerted to this by a colleague, but it was still working on my computer. I checked his version of Excel against mine and his was newer. I noticed there were new Windows updates, so I did the update. After I applied pending updates, it now no longer works on my computer. I cannot check the ActiveX checkboxes any longer, and, as a part of trying to debug, it appears I cannot even add an ActiveX control to any worksheet, even a new worksheet, any more. I get an error dialog that says, "Cannot insert object." (I can still add form controls, just not ActiveX.) Anyone else experiencing this after a recent update? Any suggestions?
Thanks,
Mike
From other forums, I have learned that it is due to the MS Update and that a good fix is to simply delete the file MSForms.exd from any Temp subfolder in the user's profile. For instance:
C:\Users\[user.name]\AppData\Local\Temp\Excel8.0\MSForms.exd
C:\Users\[user.name]\AppData\Local\Temp\VBE\MSForms.exd
C:\Users\[user.name]\AppData\Local\Temp\Word8.0\MSForms.exd
Of course the application (Excel, Word...) must be closed in order to delete this file.
Here is the best answer that I have found on the Microsoft Excel Support Team Blog
For some users, Forms Controls (FM20.dll) are no longer working as
expected after installing December 2014 updates. Issues are
experienced at times such as when they open files with existing VBA
projects using forms controls, try to insert a forms control in to a
new worksheet or run third party software that may use these
components.
You may received errors such as:
"Cannot insert object" "Object library invalid or contains references
to object definitions that could not be found"
Additionally, you may be unable to use or change properties of an
ActiveX control on a worksheet or receive an error when trying to
refer to an ActiveX control as a member of a worksheet via code.
Steps to follow after the update:
To resolve this issue, you must delete the cached versions of the
control type libraries (extender files) on the client computer. To do
this, you must search your hard disk for files that have the ".exd"
file name extension and delete all the .exd files that you find. These
.exd files will be re-created automatically when you use the new
controls the next time that you use VBA. These extender files will be
under the user's profile and may also be in other locations, such as
the following:
%appdata%\Microsoft\forms
%temp%\Excel8.0
%temp%\VBE
Scripting solution:
Because this problem may affect more than one machine, it is also
possible to create a scripting solution to delete the EXD files and
run the script as part of the logon process using a policy. The script
you would need should contain the following lines and would need to be
run for each USER as the .exd files are USER specific.
del %temp%\vbe\*.exd
del %temp%\excel8.0\*.exd
del %appdata%\microsoft\forms\*.exd
del %appdata%\microsoft\local\*.exd
del %appdata%\Roaming\microsoft\forms\*.exd
del %temp%\word8.0\*.exd
del %temp%\PPT11.0\*.exd
Additional step:
If the steps above do not resolve your issue, another step that can be
tested (see warning below):
On a fully updated machine and after removing the .exd files, open the file in Excel with edit permissions.
Open Visual Basic for Applications > modify the project by adding a comment or edit of some kind to any code module > Debug > Compile
VBAProject.
Save and reopen the file. Test for resolution. If resolved, provide this updated project to additional users.
Warning: If this step resolves your issue, be aware that after deploying this updated project to the other users, these users will
also need to have the updates applied on their systems and .exd files
removed as well.
If this does not resolve your issue, it may be a different issue and
further troubleshooting may be necessary.
Microsoft is currently working on this issue. Watch the blog for
updates.
Source
It was KB2553154. Microsoft needs to release a fix. As a developer of Excel applications we can't go to all our clients computers and delete files off them. We are getting blamed for something Microsoft caused.
I'm an Excel developer, and I definitely felt the pain when this happened. Fortunately, I was able to find a workaround by renaming the MSForms.exd files in VBA even when Excel is running, which also can fix the issue. Excel developers who need to distribute their spreadsheets can add the following VBA code to their spreadsheets to make them immune to the MS update.
Place this code in any module.
Public Sub RenameMSFormsFiles()
Const tempFileName As String = "MSForms - Copy.exd"
Const msFormsFileName As String = "MSForms.exd"
On Error Resume Next
'Try to rename the C:\Users\[user.name]\AppData\Local\Temp\Excel8.0\MSForms.exd file
RenameFile Environ("TEMP") & "\Excel8.0\" & msFormsFileName, Environ("TEMP") & "\Excel8.0\" & tempFileName
'Try to rename the C:\Users\[user.name]\AppData\Local\Temp\VBE\MSForms.exd file
RenameFile Environ("TEMP") & "\VBE\" & msFormsFileName, Environ("TEMP") & "\VBE\" & tempFileName
End Sub
Private Sub RenameFile(fromFilePath As String, toFilePath As String)
If CheckFileExist(fromFilePath) Then
DeleteFile toFilePath
Name fromFilePath As toFilePath
End If
End Sub
Private Function CheckFileExist(path As String) As Boolean
CheckFileExist = (Dir(path) <> "")
End Function
Private Sub DeleteFile(path As String)
If CheckFileExist(path) Then
SetAttr path, vbNormal
Kill path
End If
End Sub
The RenameMSFormsFiles subroutine tries to rename the MSForms.exd files in the C:\Users\[user.name]\AppData\Local\Temp\Excel8.0\ and C:\Users\[user.name]\AppData\Local\Temp\VBE\ folders to MSForms - Copy.exd.
Then call the RenameMSFormsFiles subroutine at the very beginning of the Workbook_Open event.
Private Sub Workbook_Open()
RenameMSFormsFiles
End Sub
The spreadsheet will try to rename the MSForms.exd files when it opens. Obviously, this is not a perfect fix:
The affected user will still experience the ActiveX control errors when running the VBA code the very first time opening the spreadsheet. Only after executing the VBA code once and restarting Excel, the issue is fixed. Normally when a user encounters a broken spreadsheet, the knee-jerk reaction is to close Excel and try to open the spreadsheet again. :)
The MSForms.exd files are renamed every time the spreadsheet opens, even when there's no issue with the MSForms.exd files. But the spreadsheet will work just fine.
At least for now, Excel developers can continue to distribute their work with this workaround until Microsoft releases a fix.
I've posted this solution here.
With Windows 8.1 I couldn't find any .exd files using windows search. On the other hand, a cmd command dir *.exd /S found the one file on my system.
Advice in KB and above didn't work for me. I discovered that if one Excel 2007 user (with or without the security update; not sure of exact circumstances that cause this) saves the file, the original error returns.
I discovered that the fastest way to repair the file again is to delete all the VBA code. Save. Then replace the VBA code (copy/paste). Save. Before attempting this, I delete the .EXD files first, because otherwise I get an error on open.
In my case, I cannot upgrade/update all users of my Excel file in various locations. Since the problem comes back after some users save the Excel file, I am going to have to replace the ActiveX control with something else.
The best source of information and updates on this issue I could find is in the TechNet Blogs » The Microsoft Excel Support Team Blog (as mentioned):
Form Controls stop working after December 2014 Updates (Updated March 10, 2015)
On March 2015 a hotfix was released in addition to the automated fix-it and manual instructions, and it's available on Windows Update as well.
The latest update and fix from Microsoft:
3025036 "Cannot insert object" error in an ActiveX custom Office solution after you install the MS14-082 security update
STATUS: Update March 10, 2015:
Hotfixes for this issue have been released in the March 2015 Updates for Office 2007, 2010 & 2013.
General info about the problem:
For some users, Form Controls (FM20.dll) are no longer working as expected after installing MS14-082 Microsoft Office Security Updates for December 2014. Issues are experienced at times such as when they open files with existing VBA projects using forms controls, try to insert a forms control in to a new worksheet or run third party software that may use these components.
https://technet.microsoft.com/en-us/library/security/ms14-082.aspx
You may receive errors such as:
"Cannot insert object"; "Object library invalid or contains references to object definitions that could not be found"; "The program used to create this object is Forms. That program is either not installed on your computer or it is not responding. To edit this object, install Forms or ensure that any dialog boxes in Forms are closed." [...]
Additionally, you may be unable to use or change properties of an ActiveX control on a worksheet or receive an error when trying to refer to an ActiveX control as a member of a worksheet via code.
Manual and additional solutions:
Scripting solution:
Because this problem may affect more than one machine, it is also possible to create a scripting solution to delete the EXD files and run the script as part of the logon process using a policy. The script you would need should contain the following lines and would need to be run for each USER as the .exd files are USER specific.
del %temp%\vbe\*.exd
del %temp%\excel8.0\*.exd
del %appdata%\microsoft\forms\*.exd
del %appdata%\microsoft\local\*.exd
del %temp%\word8.0\*.exd
del %temp%\PPT11.0\*.exd
Additional step:
If the steps above do not resolve your issue, another step that can be tested (see warning below):
On a fully updated machine and after removing the .exd files, open the file in Excel with edit permissions.
Open Visual Basic for Applications > modify the project by adding a comment or edit of some kind to any code module > Debug > Compile VBAProject.
Save and reopen the file. Test for resolution.
If resolved, provide this updated project to additional users.
Warning: If this step resolves your issue, be aware that after deploying this updated project to the other users, these users will also need to have the updates applied on their systems and .exd files removed as well.
Simplified instructions for end-users. Feel free to copy/paste the following.
Here’s how to fix the problem when it comes up:
Close all your Office programs and files.
Open Windows Explorer and type %TEMP% into the address bar, then press Enter. This will take you into the system temporary folder.
Locate and delete the following folders: Excel8.0, VBE, Word8.0
Now try to use your file again, it shouldn't have any problems.
You might need to wait until the problem occurs in order for this fix to work. Applying it prematurely (before the Windows Update gets installed on your system) won't help.
I did finally find this answer on the official Microsoft KB:
http://support.microsoft.com/kb/3025036/EN-US
No new information here than what we have in previous answers, but at least it acknowledges that Microsoft is aware of the issue.
I know many answers have already been posted for this, but neither one answer independently worked for my site. So here is what worked for me:
Step 1: Uninstall the following updates - KB2920789, KB2920790, KB2920792, KB2920793, KB2984942, KB2596927
Step 2: Hide these updates so they do not get installed on subsequent reboots
Step 3: Delete folder Excel8.0 from C:\Users\<>\AppData\Local\Temp
Step 4: Restart workstatiion (I would also make sure the above mentioned KBs did not inadvertently get applied)
I want to provide an answer that worked as the only thing for me (I realize that I might be the only one ever). I had in one macro that I was calling using the ribbon. It had the following code:
colStore = new Collection
I wasn't aware that it throws an error so I was baffled and tried everything in here. The button just stopped working and I couldn't get it to work. When I noticed the error and corrected it to:
Set colStore = new Collection
It started working again. Absolutely strange if you ask me but maybe it helps someone out there who was as desperate as me.
I have some Excel worksheets that use ActiveX checkboxes to control certain activity. They worked recently but today started to give errors. I was alerted to this by a colleague, but it was still working on my computer. I checked his version of Excel against mine and his was newer. I noticed there were new Windows updates, so I did the update. After I applied pending updates, it now no longer works on my computer. I cannot check the ActiveX checkboxes any longer, and, as a part of trying to debug, it appears I cannot even add an ActiveX control to any worksheet, even a new worksheet, any more. I get an error dialog that says, "Cannot insert object." (I can still add form controls, just not ActiveX.) Anyone else experiencing this after a recent update? Any suggestions?
Thanks,
Mike
From other forums, I have learned that it is due to the MS Update and that a good fix is to simply delete the file MSForms.exd from any Temp subfolder in the user's profile. For instance:
C:\Users\[user.name]\AppData\Local\Temp\Excel8.0\MSForms.exd
C:\Users\[user.name]\AppData\Local\Temp\VBE\MSForms.exd
C:\Users\[user.name]\AppData\Local\Temp\Word8.0\MSForms.exd
Of course the application (Excel, Word...) must be closed in order to delete this file.
Here is the best answer that I have found on the Microsoft Excel Support Team Blog
For some users, Forms Controls (FM20.dll) are no longer working as
expected after installing December 2014 updates. Issues are
experienced at times such as when they open files with existing VBA
projects using forms controls, try to insert a forms control in to a
new worksheet or run third party software that may use these
components.
You may received errors such as:
"Cannot insert object" "Object library invalid or contains references
to object definitions that could not be found"
Additionally, you may be unable to use or change properties of an
ActiveX control on a worksheet or receive an error when trying to
refer to an ActiveX control as a member of a worksheet via code.
Steps to follow after the update:
To resolve this issue, you must delete the cached versions of the
control type libraries (extender files) on the client computer. To do
this, you must search your hard disk for files that have the ".exd"
file name extension and delete all the .exd files that you find. These
.exd files will be re-created automatically when you use the new
controls the next time that you use VBA. These extender files will be
under the user's profile and may also be in other locations, such as
the following:
%appdata%\Microsoft\forms
%temp%\Excel8.0
%temp%\VBE
Scripting solution:
Because this problem may affect more than one machine, it is also
possible to create a scripting solution to delete the EXD files and
run the script as part of the logon process using a policy. The script
you would need should contain the following lines and would need to be
run for each USER as the .exd files are USER specific.
del %temp%\vbe\*.exd
del %temp%\excel8.0\*.exd
del %appdata%\microsoft\forms\*.exd
del %appdata%\microsoft\local\*.exd
del %appdata%\Roaming\microsoft\forms\*.exd
del %temp%\word8.0\*.exd
del %temp%\PPT11.0\*.exd
Additional step:
If the steps above do not resolve your issue, another step that can be
tested (see warning below):
On a fully updated machine and after removing the .exd files, open the file in Excel with edit permissions.
Open Visual Basic for Applications > modify the project by adding a comment or edit of some kind to any code module > Debug > Compile
VBAProject.
Save and reopen the file. Test for resolution. If resolved, provide this updated project to additional users.
Warning: If this step resolves your issue, be aware that after deploying this updated project to the other users, these users will
also need to have the updates applied on their systems and .exd files
removed as well.
If this does not resolve your issue, it may be a different issue and
further troubleshooting may be necessary.
Microsoft is currently working on this issue. Watch the blog for
updates.
Source
It was KB2553154. Microsoft needs to release a fix. As a developer of Excel applications we can't go to all our clients computers and delete files off them. We are getting blamed for something Microsoft caused.
I'm an Excel developer, and I definitely felt the pain when this happened. Fortunately, I was able to find a workaround by renaming the MSForms.exd files in VBA even when Excel is running, which also can fix the issue. Excel developers who need to distribute their spreadsheets can add the following VBA code to their spreadsheets to make them immune to the MS update.
Place this code in any module.
Public Sub RenameMSFormsFiles()
Const tempFileName As String = "MSForms - Copy.exd"
Const msFormsFileName As String = "MSForms.exd"
On Error Resume Next
'Try to rename the C:\Users\[user.name]\AppData\Local\Temp\Excel8.0\MSForms.exd file
RenameFile Environ("TEMP") & "\Excel8.0\" & msFormsFileName, Environ("TEMP") & "\Excel8.0\" & tempFileName
'Try to rename the C:\Users\[user.name]\AppData\Local\Temp\VBE\MSForms.exd file
RenameFile Environ("TEMP") & "\VBE\" & msFormsFileName, Environ("TEMP") & "\VBE\" & tempFileName
End Sub
Private Sub RenameFile(fromFilePath As String, toFilePath As String)
If CheckFileExist(fromFilePath) Then
DeleteFile toFilePath
Name fromFilePath As toFilePath
End If
End Sub
Private Function CheckFileExist(path As String) As Boolean
CheckFileExist = (Dir(path) <> "")
End Function
Private Sub DeleteFile(path As String)
If CheckFileExist(path) Then
SetAttr path, vbNormal
Kill path
End If
End Sub
The RenameMSFormsFiles subroutine tries to rename the MSForms.exd files in the C:\Users\[user.name]\AppData\Local\Temp\Excel8.0\ and C:\Users\[user.name]\AppData\Local\Temp\VBE\ folders to MSForms - Copy.exd.
Then call the RenameMSFormsFiles subroutine at the very beginning of the Workbook_Open event.
Private Sub Workbook_Open()
RenameMSFormsFiles
End Sub
The spreadsheet will try to rename the MSForms.exd files when it opens. Obviously, this is not a perfect fix:
The affected user will still experience the ActiveX control errors when running the VBA code the very first time opening the spreadsheet. Only after executing the VBA code once and restarting Excel, the issue is fixed. Normally when a user encounters a broken spreadsheet, the knee-jerk reaction is to close Excel and try to open the spreadsheet again. :)
The MSForms.exd files are renamed every time the spreadsheet opens, even when there's no issue with the MSForms.exd files. But the spreadsheet will work just fine.
At least for now, Excel developers can continue to distribute their work with this workaround until Microsoft releases a fix.
I've posted this solution here.
With Windows 8.1 I couldn't find any .exd files using windows search. On the other hand, a cmd command dir *.exd /S found the one file on my system.
Advice in KB and above didn't work for me. I discovered that if one Excel 2007 user (with or without the security update; not sure of exact circumstances that cause this) saves the file, the original error returns.
I discovered that the fastest way to repair the file again is to delete all the VBA code. Save. Then replace the VBA code (copy/paste). Save. Before attempting this, I delete the .EXD files first, because otherwise I get an error on open.
In my case, I cannot upgrade/update all users of my Excel file in various locations. Since the problem comes back after some users save the Excel file, I am going to have to replace the ActiveX control with something else.
The best source of information and updates on this issue I could find is in the TechNet Blogs » The Microsoft Excel Support Team Blog (as mentioned):
Form Controls stop working after December 2014 Updates (Updated March 10, 2015)
On March 2015 a hotfix was released in addition to the automated fix-it and manual instructions, and it's available on Windows Update as well.
The latest update and fix from Microsoft:
3025036 "Cannot insert object" error in an ActiveX custom Office solution after you install the MS14-082 security update
STATUS: Update March 10, 2015:
Hotfixes for this issue have been released in the March 2015 Updates for Office 2007, 2010 & 2013.
General info about the problem:
For some users, Form Controls (FM20.dll) are no longer working as expected after installing MS14-082 Microsoft Office Security Updates for December 2014. Issues are experienced at times such as when they open files with existing VBA projects using forms controls, try to insert a forms control in to a new worksheet or run third party software that may use these components.
https://technet.microsoft.com/en-us/library/security/ms14-082.aspx
You may receive errors such as:
"Cannot insert object"; "Object library invalid or contains references to object definitions that could not be found"; "The program used to create this object is Forms. That program is either not installed on your computer or it is not responding. To edit this object, install Forms or ensure that any dialog boxes in Forms are closed." [...]
Additionally, you may be unable to use or change properties of an ActiveX control on a worksheet or receive an error when trying to refer to an ActiveX control as a member of a worksheet via code.
Manual and additional solutions:
Scripting solution:
Because this problem may affect more than one machine, it is also possible to create a scripting solution to delete the EXD files and run the script as part of the logon process using a policy. The script you would need should contain the following lines and would need to be run for each USER as the .exd files are USER specific.
del %temp%\vbe\*.exd
del %temp%\excel8.0\*.exd
del %appdata%\microsoft\forms\*.exd
del %appdata%\microsoft\local\*.exd
del %temp%\word8.0\*.exd
del %temp%\PPT11.0\*.exd
Additional step:
If the steps above do not resolve your issue, another step that can be tested (see warning below):
On a fully updated machine and after removing the .exd files, open the file in Excel with edit permissions.
Open Visual Basic for Applications > modify the project by adding a comment or edit of some kind to any code module > Debug > Compile VBAProject.
Save and reopen the file. Test for resolution.
If resolved, provide this updated project to additional users.
Warning: If this step resolves your issue, be aware that after deploying this updated project to the other users, these users will also need to have the updates applied on their systems and .exd files removed as well.
Simplified instructions for end-users. Feel free to copy/paste the following.
Here’s how to fix the problem when it comes up:
Close all your Office programs and files.
Open Windows Explorer and type %TEMP% into the address bar, then press Enter. This will take you into the system temporary folder.
Locate and delete the following folders: Excel8.0, VBE, Word8.0
Now try to use your file again, it shouldn't have any problems.
You might need to wait until the problem occurs in order for this fix to work. Applying it prematurely (before the Windows Update gets installed on your system) won't help.
I did finally find this answer on the official Microsoft KB:
http://support.microsoft.com/kb/3025036/EN-US
No new information here than what we have in previous answers, but at least it acknowledges that Microsoft is aware of the issue.
I know many answers have already been posted for this, but neither one answer independently worked for my site. So here is what worked for me:
Step 1: Uninstall the following updates - KB2920789, KB2920790, KB2920792, KB2920793, KB2984942, KB2596927
Step 2: Hide these updates so they do not get installed on subsequent reboots
Step 3: Delete folder Excel8.0 from C:\Users\<>\AppData\Local\Temp
Step 4: Restart workstatiion (I would also make sure the above mentioned KBs did not inadvertently get applied)
I want to provide an answer that worked as the only thing for me (I realize that I might be the only one ever). I had in one macro that I was calling using the ribbon. It had the following code:
colStore = new Collection
I wasn't aware that it throws an error so I was baffled and tried everything in here. The button just stopped working and I couldn't get it to work. When I noticed the error and corrected it to:
Set colStore = new Collection
It started working again. Absolutely strange if you ask me but maybe it helps someone out there who was as desperate as me.
I have an Excel 2010 macro application that is made up of several workbook files.
FileName (ProjectName)
VFApp.xlsm (VFAppVBA)
VFReportClasses.xlsm (VFReportVBA)
VFImportClasses.xlsm (VFImportVBA)
VFDataClasses.xlsm (VFDataVBA)
ZShared.xlsm (ZSharedVBA)
Shared is referenced by all the other workbooks.
Data is referenced by App, Report, & Import.
Report and Import are both referenced by App.
I'm trying to close all the referenced files when the App file is closed. This works for everything except ZShared.xlsm. For it I get the 'This workbook is currently referenced by another workbook and cannot be closed.' error.
The only semi-helpful info I found online was http://support.microsoft.com/kb/211856
and http://support.microsoft.com/default.aspx?scid=kb;en-us;159794. I added some logging to all the classes in ZShared. All instances of it's classes are getting correctly terminated and I don't have any workbook objects pointing to ZShared.
I even tried renaming the files like (http://www.allquests.com/question/3996335/Upgrading-Add-ins-from-XL2003-to-XL2007.html).
The weird thing is, if I manually open VFDataClasses.xlsm before opening VFApp.xlsm, then ZShared will close out correctly without error. If I just open VFApp.xlsm and let it open all the other referenced files, I get the above error.
Anybody have any suggestions for figuring out why Excel thinks the workbook is still referenced?
Clairification:
Each workbook references the others via Tools -> References.
ZShared consists of public classes and modules with public subs, functions, and constants as well as 3 global variables.
I'm not, that I know of, doing anything to reference ZShared's workbooks or other Excel objects.
The global variables are in ZShared so I don't have to recreate them in each App that references ZShared. They are handled via public InitializeGlobalClasses and TerminateGlobalClasses
I added an m_InstanceId to every class and debug logging to all Class_Initialize and Class_Terminate so I am 100% certain that all instances of the classes are being terminated correctly.
I wonder if it is possible Excel is creating some hidden reference to the workbook based on using a With statement or some such that isn't being cleared correctly. On the other hand, it makes no sense that this would only happen if ZShared was not already open when the App started.
I never found an answer to why Excel thinks the file is still referenced. As a work-around I ended up doing 2 things.
Hid the ZShared workbook in Excel so normal users can't see it.
Set ZShared to Read Only so I can replace the file with an updated version even if people still have it open.
If anyone knows of a way to peer into Excel's internals to see why its reference garbage collection is not working, I'd love to know.