GNOME freezes in FC6
 

I'm running FC6 in a Parallels VM under OS X.

Every so often, my Fedora freezes and I've realized that it's only the GNOME interface. I can ssh into the VM from my outside Mac and even pop X-sessions from it, but I no longer have mouse or keyboard control of the Fedora Desktop itself. Occasionally if I use ps -aux and choose some graphical process (i.e. like Thunderbird or Firefox) and kill it, it "jump starts" GNOME and I get control back. But this is "iffy" at best. Usually I just end up doing a "skill -KILL -u van" and then logging back in.

Anyone have a clue as to what could be causing this?