Comment # 4 on bug 1001660 from Fabian Vogt

(In reply to Axel Braun from comment #3)
> After upgrade to RC1 the situation has improved - desktop remains responsive
> and it can be switched between applications. Shutdown via Menu still does
> not work - has to be done from command line.
> I have no idea how to use gdb, can you provide a link to explain?

If you can reproduce the issue, try to get a listing of active processes before
and after the update. I suspect that either some programs crashed due to
unexpected file changes or some imporant services were restarted.