There are no problems in the compiz log you pasted, gnome-session just shuts down compiz too soon.
** Package changed: compiz (Ubuntu) => gnome-session (Ubuntu) -- screen not composited on shutdown, ran compiz - errors https://bugs.launchpad.net/bugs/514617 You received this bug notification because you are a member of compiz packagers, which is subscribed to compiz in ubuntu. _______________________________________________ Mailing list: https://launchpad.net/~compiz Post to : [email protected] Unsubscribe : https://launchpad.net/~compiz More help : https://help.launchpad.net/ListHelp
