I think that's a glitch in the rendering department... compiz in particular. A workaround might be to use fusion-icon to switch to Metacity.
** Also affects: compiz (Ubuntu) Importance: Undecided Status: New ** Changed in: linuxmint Status: New => Triaged -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/781578 Title: Inconsistent gnome panel -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs