And now for something completely different: I was not sure where to put this. Not a bug, just strange and only working (not working) with Firefox. I have two monitors, left is the main page of Publisher with the workspace and tools and menus, right monitor for all the panels. Additionally Firefox is located on the right monitor. When I try to drag a Firefox tab from right to left monitor when Publisher is in the background nothing happens. I have to minimize Publisher first. It is only the Publisher/Firefox-combination. Chrome has no problem.