I'm using a Mac OS 10.7.5 The whole tour including video-screens I added worked fine. All of a sudden the top of the screen moved down to the bottom. So all the video-screen are now displaced but still playing. I can fixed the problem by deleting the screens and rebuild them again. But after some changes here and there in the buttons the video-screens pop back to the wrong place.
Maybe this is a bug? Or is it something I can fix my self within the software?