I'm still experiencing it, too. It happened to me few times when I was trying to open sound preferences menu from the sound applet.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/709461 Title: semi-random invisible window with x geometry on top layer possible, all viewport only (one ws though) -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
