This happens to me occasionally while quickly using Compiz's expo and scale features. Right clicking on the compiz icon (I installed it) and selected Reload Window Manager fixes it.
-- window title bar disappears completely on all windows https://bugs.launchpad.net/bugs/148958 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs