Perhaps it's related to this gtk+ bug: https://bugzilla.gnome.org/show_bug.cgi?id=640995
Especially the second video shows a issue very similar to this. ** Bug watch added: GNOME Bug Tracker #640995 https://bugzilla.gnome.org/show_bug.cgi?id=640995 -- You received this bug notification because you are a member of compiz packagers, which is subscribed to compiz in Ubuntu. https://bugs.launchpad.net/bugs/961518 Title: Menu rendering leaves lingering shadow outlines To manage notifications about this bug go to: https://bugs.launchpad.net/compiz/+bug/961518/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~compiz Post to : [email protected] Unsubscribe : https://launchpad.net/~compiz More help : https://help.launchpad.net/ListHelp
