Tom, your problem is different and is a known problem with the nvidia driver when using two screens (not twinview). The original bug listed here was a problem with gnome-control-center that should be fixed now.
** Changed in: gnome-control-center (Ubuntu) Sourcepackagename: compiz => gnome-control-center Status: Confirmed => Fix Released -- window borders disappear with enhanced visual effects turned on https://bugs.launchpad.net/bugs/179773 You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gnome-control-center in ubuntu. -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs