My ubuntu is 10.04. The top and bottom gnome-panel suddenly become transparent. However mouse click the position of menu, the Application menu could be shown.
It could be fixed by restarting my x-seesion(logout then login). But it would happen again in several hours.
Does anyone have idea to fix it permanently?
The compiz is off. However the panel will show after changing the 'Visual Effects' option from 'none' to 'normal'.
Update2: Changing theme also make the panel visible again. But it would be invisible again in minutes.