Ran into a strange issue with Visual Studio 2008 SP1 where it crashed, vanished with no errors, if I selected the Choose items menu item in the context menu of the Windows Forms designer Toolbox window. Attaching a debugger and reproducing the crash gave me the following error.
Wed Feb 25 15:47:55.617 2009 (GMT+1): CLR:(
Wed Feb 25 15:47:55.617 2009 (GMT+1): C:\Windows\assembly\GAC_MSIL\System.ComponentModel.DataAnnotations\126.96.36.199__31bf3856ad364e35\System.ComponentModel.DataAnnotations.dll
Wed Feb 25 15:47:55.618 2009 (GMT+1): )
Wed Feb 25 15:47:55.618 2009 (GMT+1): Rejecting native image because dependency C:\Windows\assembly\GAC_MSIL\System.Core\188.8.131.52__b77a5c561934e089\System.Core.dll is not native
Wed Feb 25 15:47:55.619 2009 (GMT+1):
Wed Feb 25 15:47:55.619 2009 (GMT+1): ModLoad: 00000000`5aee0000 00000000`5aef2000 System.ComponentModel.DataAnnotations.dll
I have no idea what has caused this, but closing all Visual Studio instances and then starting it once with the /safemode switch and then closing it seems to have fixed the crash.