This keeps happening to me now. I usually have to restart X with Ctrl+Alt+PrtSc+K, log back in, and kill the extra compiz process. Sometimes I have to do it twice.
I've attached a backtrace ** Attachment added: "backtrace of compiz after crash using tty1" https://bugs.launchpad.net/ubuntu/+source/compiz/+bug/815996/+attachment/2743110/+files/compiz_debug.log -- You received this bug notification because you are a member of compiz packagers, which is subscribed to compiz in Ubuntu. https://bugs.launchpad.net/bugs/815996 Title: Desktop occasionally freezes/locks up when switching workspaces To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/compiz/+bug/815996/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~compiz Post to : [email protected] Unsubscribe : https://launchpad.net/~compiz More help : https://help.launchpad.net/ListHelp

