Sure. Just open the app in question. Unity then thinks it is open (displaying a small arrow besides its icon), but the window is not visible.
** Changed in: unity (Ubuntu) Status: Incomplete => New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/899874 Title: Windows not appearing or invisible To manage notifications about this bug go to: https://bugs.launchpad.net/unity/+bug/899874/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs