vim find out what is changing the directory - vim

Question

I usually start vim from the folder where I have my Makefile and tags file
and edit a file that is two levels down the three.
So if I am at folder x I usually would do vim x1/x2/code.c
The problem is that recently vim changes the folder to the folder where the code is (so if I do pwd it will show x1/x2).
I want it to stay at the top folder.
Is there a way of knowing what is causing the change of folder? I am assuming that is some kind of plugin but have not been able to track it down.
Thanks.

Answer 1

Check if you have autochdir turned on in your vimrc. :set autochdir? to check.
There are any number of plugins that could be doing it, do you happen to remember what you've installed recently?

Answer 2

This is the request for the Benoit answer. (I am not sure if I should post it as an answer or edit the question).
1: .vimrc
2: temp/MyInstalls/linux/Packages/vim73/share/vim/vim73/syntax/syntax.vim
3: temp/MyInstalls/linux/Packages/vim73/share/vim/vim73/syntax/synload.vim
4: temp/MyInstalls/linux/Packages/vim73/share/vim/vim73/syntax/syncolor.vim
5: temp/MyInstalls/linux/Packages/vim73/share/vim/vim73/filetype.vim
6: temp/MyInstalls/linux/Packages/vim73/share/vim/vim73/ftplugin.vim
7: temp/MyInstalls/linux/Packages/vim73/share/vim/vim73/indent.vim
8: .vim/colors/graywh_cs.vim
9: .vim/plugin/AlignMapsPlugin.vim
10: .vim/plugin/AlignPlugin.vim
11: .vim/plugin/ColorSchemes.vim
12: .vim/plugin/NERD_commenter.vim
13: .vim/plugin/NERD_tree.vim
14: .vim/plugin/SyntaxFolds.vim
15: .vim/plugin/a.vim
16: .vim/plugin/ack.vim
17: .vim/plugin/bufexplorer.vim
18: .vim/plugin/buftabs.vim
19: .vim/plugin/c.vim
20: .vim/plugin/cecutil.vim
21: .vim/plugin/changeColorScheme.vim
22: .vim/plugin/conque_term.vim
23: .vim/plugin/crefvim.vim
24: .vim/plugin/cscope_maps.vim
25: .vim/plugin/d/ColorSchemeMenuMaker.vim
26: .vim/plugin/d/ColorSchemes.vim
27: .vim/plugin/d/filebrowser.vim
28: .vim/plugin/d/libList.vim
29: .vim/plugin/echofunc.vim
30: .vim/plugin/filebrowser.vim
31: .vim/plugin/fuf.vim
32: .vim/autoload/fuf/buffer.vim
33: .vim/autoload/fuf.vim
34: .vim/autoload/fuf/file.vim
35: .vim/autoload/fuf/dir.vim
36: .vim/autoload/fuf/bookmark.vim
37: .vim/autoload/fuf/tag.vim
38: .vim/autoload/fuf/taggedfile.vim
39: .vim/autoload/fuf/jumplist.vim
40: .vim/autoload/fuf/changelist.vim
41: .vim/autoload/fuf/quickfix.vim
42: .vim/autoload/fuf/line.vim
43: .vim/autoload/fuf/help.vim
44: .vim/autoload/fuf/givenfile.vim
45: .vim/autoload/fuf/givendir.vim
46: .vim/autoload/fuf/givencmd.vim
47: .vim/autoload/fuf/callbackfile.vim
48: .vim/autoload/fuf/callbackitem.vim
49: .vim/plugin/imaps.vim
50: .vim/plugin/libList.vim
51: .vim/plugin/lightWeightArray.vim
52: .vim/plugin/matchit.vim
53: .vim/plugin/mru.vim
54: .vim/plugin/outlinetoggle.vim
55: .vim/plugin/remoteOpen.vim
56: .vim/plugin/scratch.vim
57: .vim/plugin/snipMate.vim
58: .vim/plugin/srcexpl.vim
59: .vim/plugin/supertab.vim
60: .vim/plugin/swap_parameters.vim
61: .vim/plugin/taglist.vim
62: .vim/plugin/timestamp.vim
63: .vim/plugin/totd.vim
64: .vim/plugin/ttcplug.vim
65: temp/MyInstalls/linux/Packages/vim73/share/vim/vim73/plugin/getscriptPlugin.vim
66: temp/MyInstalls/linux/Packages/vim73/share/vim/vim73/plugin/gzip.vim
67: temp/MyInstalls/linux/Packages/vim73/share/vim/vim73/plugin/matchparen.vim
68: temp/MyInstalls/linux/Packages/vim73/share/vim/vim73/plugin/netrwPlugin.vim
69: temp/MyInstalls/linux/Packages/vim73/share/vim/vim73/plugin/rrhelper.vim
70: temp/MyInstalls/linux/Packages/vim73/share/vim/vim73/plugin/spellfile.vim
71: temp/MyInstalls/linux/Packages/vim73/share/vim/vim73/plugin/tarPlugin.vim
72: temp/MyInstalls/linux/Packages/vim73/share/vim/vim73/plugin/tohtml.vim
73: temp/MyInstalls/linux/Packages/vim73/share/vim/vim73/plugin/vimballPlugin.vim
74: temp/MyInstalls/linux/Packages/vim73/share/vim/vim73/plugin/zipPlugin.vim
75: .vim/after/plugin/snipMate.vim
76: .vim/nerdtree_plugin/exec_menuitem.vim
77: .vim/nerdtree_plugin/fs_menu.vim
78: temp/MyInstalls/linux/Packages/vim73/share/vim/vim73/scripts.vim