I have the same symptoms. However, on my system, using Alt-Tab too many times to cycle through all of my windows triggers 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 the bug contact for Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
