I agree with Maximilian Federle (comment #3). This is not the same behavior.
In my case, I use my HD tv as a second monitor, to view movies. If I drag a movie to my tv and put it fullscreen (VLC) it displays completely correctly. If however someone else is opens another application or brings focus to it, the top panel and launcher become visible on top of the movie (that keeps playing fine.)
I agree with Maximilian Federle (comment #3). This is not the same behavior.
In my case, I use my HD tv as a second monitor, to view movies. If I drag a movie to my tv and put it fullscreen (VLC) it displays completely correctly. If however someone else is opens another application or brings focus to it, the top panel and launcher become visible on top of the movie (that keeps playing fine.)