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 Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs