devenv.exe /resetaddin doesn't fully reset the add-in
Although I don't use permanent commandbars in my MZ-Tools but temporary ones, I became aware of a bug when writing the samples that use permanent user interface of the article HOWTO: Adding buttons, commandbars and toolbars to Visual Studio .NET from an add-in, and I mentioned it in this article and this post. The bug is that executing devenv.exe /resetaddin resets commands and CommandBarButtons, but not permanent commandbars.
Today I finally have reported it to Microsoft, just in case they want to fix it for VS 2010:
devenv.exe /resetaddin doesn't reset permanent add-in commandbars
If you are affected by this problem, vote for it there.
As a workaround, remove the commandbar by code in the ext_cm_UISetup phase of the OnConnection method before adding it again.
BTW, if you are curious about where VS persists information of commands, commandbars, etc., it is the file CmdUI.prf stored here (Windows XP):
C:\Documents and Settings\<user>\Application Data\Microsoft\VisualStudio\<version>\1033
where <user> is your Windows user name and <version> is:
7.0 (VS.NET 2002)
7.1 (VS.NET 2003)
8.0 (VS 2005)
9.0 (VS 2008)
10.0 (VS 2010)
Deleting that file removes all the commands, buttons, commandbars, etc. of add-ins or user customizations.