frozen gnome 3 desktop

[L]

Hi
After upgraded to fedora 15, most are working well. The gnome 3
desktop are weired. It frequently freeze, not responding to mouse or
keyboard. I have to login a virtual term (alt+ctrl+F2) to restart gdm
(init 3; init 5). I checked Xorg.0.log file and output of dmesg, I
can't spot any hint.

Linux  2.6.38.8-32.fc15.x86_64 #1 SMP Mon Jun 13 19:49:05 UTC 2011
x86_64 x86_64 x86_64 GNU/Linux

Any one experienced this or where is find a fix? thanks
Y

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