If it appears on place of alt-tab switcher, it would be not unreasonable to switch off this plug-in and replace by ring switcher for example. I did this yesterday, and do not see this problem as yet.
-- 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: Application windows can sometimes fail to display and will mask regions of the screen -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
