It happened a few times before and it happend again. This first time when it happen to Visual Studio 2008 sp1. When I tried to choose items in Visual Studio toolbox, Visual Studio crashes. I tried usual cure:
devenv.exe /resetsettings
In this case you need to back up all your settings and then restore them. Usually it helps, but not this time. Ofcourse I tried right click on toolbox and do:
Reset Toolbox
As usual it didn't help. Finally I found solution. You need to run Visual Studio in safe mode.
devenv /safemode
Then try to do Choose Items in safe mode. Click on each tab. Press ok on any errors and you are done.