Just hit this. Using the proceedure below I was able to get an xwininfo on the window, which was xchat:
ctrl-alt-T to get a terminal run xwininfo and click where the problem area is ** Attachment added: "XCHAT" https://bugs.launchpad.net/ubuntu/+source/compiz/+bug/709461/+attachment/1824411/+files/XCHAT -- 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
