I'm using iMovie '11 to make a slideshow out of some photos I have in my library. The transitions etc. are really nice, and I'm enjoying the user experience very much. However, when I go under the Inspector for the still photos, I cannot change the duration! If the original duration was, say 5 seconds, and I change it to 3 seconds, when I hit done it reverts back to the 5 seconds! Please help!!