It just happened to me when there was nothing running. Right clicked on the desktop, and got this error
-- 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/857738 Title: compiz crashed with SIGABRT in raise() To manage notifications about this bug go to: https://bugs.launchpad.net/compiz/+bug/857738/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~compiz Post to : compiz@lists.launchpad.net Unsubscribe : https://launchpad.net/~compiz More help : https://help.launchpad.net/ListHelp