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-X, which is subscribed to xorg-server in ubuntu. https://bugs.launchpad.net/bugs/665546 Title: Drop and sub menus don't always show up _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp