I attached apport info above. I too am experiencing this problem. Often a menu will highlight when I click on it, but the contents will not appear. I can click several times with no effect. Sometimes adjacent menus also will not show up, but it seems inconsistent. To get the menu to appear, I usually click elsewhere on the screen (e.g. the desktop background) and then go back to the menu and try opening it again.
Note that I am NOT running an nVidia driver. The hardware driver listed under the "Additional Drivers" system admin menu is "ATI/AMD proprietary FGLRX graphics driver." I'm sure the apport info has more specific details. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/665546 Title: Drop and sub menus don't always show up -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs