What version of ubuntu? what version of xserver-xgl. Are you using beryl or compiz? can you attach the crash report in /var/crash for either gnome-panel or whatever report in there was logged for your problem.
What version of ubuntu? what version of xserver-xgl. Are you using beryl or compiz? can you attach the crash report in /var/crash for either gnome-panel or whatever report in there was logged for your problem.