I've seen this bug in Ubuntu and Debian Squeeze- it happens after emerging from screensaver with Compiz running. It's a manifestation of this Compiz bug:
https://bugs.launchpad.net/compiz/+bug/438868 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/517207 Title: Totem controls disappear when hovered over. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
