I experienced the same sub menu slow/non appearance. I'm using Ubuntu 10.10 x64 with the ATI proprietary driver. As soon as I set Visual Effects to 'None' via System/Preferences/Appearance all sub menus were available instantly.
I experienced the same sub menu slow/non appearance. I'm using Ubuntu 10.10 x64 with the ATI proprietary driver. As soon as I set Visual Effects to 'None' via System/ Preferences/ Appearance all sub menus were available instantly.