I can confirm this cosmetic problem is still present in the Edgy final release.
(there are much BIGGER problems with the Matrox drivers in Edgy, though :-( https://launchpad.net/distros/ubuntu/+source/xserver-xorg-video-mga/+bug/64853 -- Screen corruption/glitch https://launchpad.net/bugs/27227 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
