First of all, sorry for my english. I hope to explain the issue as clearly as possible.
When I run SW2011 64 bit with one or more files opened (parts assemblies, draws) and I point with the mouse on taskbar of Windows 7 showing related thumbnails of all these files, the system crashes and the only way for me is to force the restart of the PC. In particular, it seems that the crash happens when the main window of SW tries to load the file that I point on the thumbnail.
I tried to work with smaller thumbnail or to delay the generation of the thumbnail, but this issue is still coming up.