Most of the time when I try to add transitions in iMovie, it won't let me drag them down to the timeline between the clips. They won't even start to drag. Yet other times, I have no difficulty dragging them, and it behaves perfectely as it should. Is there some condition that is preventing the transitions from being dragged down to the time line. It shows the preview, but even if I say OK, I don't see it being added to the movie. Does anyone know what I might be doing wrong? I'm completely baffled here.