Hi Flog, I gave up waiting in the end I'm afraid but I understand what you want to do. I've been animating using Poser and Flash for several years now so if there's any help I can give just ask. I mostly hang out with the other Poser animators over on Poseamation (Yahoo group)we'd be pleased to review your movie, be prepared for some criticism though. Oh, it's just loaded and I can tell you immediately how to reduce your file size. You've too much detail there, that's costly in file size. Flash can handle the transparency in gif files so to get the same effects experiment with just having the one Bryce sky, give it a layer of it's own, same thing with the building, a layer of it's own and move it using tweens. A simple preloader is just to use the 'if frame is loaded' and 'go to and play' actions. 1st frame plays to frame 3, frame 3 has go to and play 1 plus if frame is loaded go to and play frame 4, a small animation on the three frames completes it.