There is no stack trace, a poor description, and the bit of .xsession- errors you pasted (and the line you put as the title) is actually metacity, not compiz. Do you have a method to reproduce this and are you sure you were using compiz at the time?
** Changed in: compiz (Ubuntu) Status: New => Incomplete -- 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/580265 Title: Buggy client sent a _NET_ACTIVE_WINDOW message with a timestamp of 0 for 0x36000c7 (Do) _______________________________________________ Mailing list: https://launchpad.net/~compiz Post to : compiz@lists.launchpad.net Unsubscribe : https://launchpad.net/~compiz More help : https://help.launchpad.net/ListHelp