I recently made my first movie in iMovie. I managed to export it as a quicktime movie, but I can't do anything with it except open and play it in Quicktime X. I tried to upload it to youtube, I got an error saying "upload failed, invalid movie." I then tried re-saving it in Quicktime X, after all it can open and play the movie right? Wrong, apparently Quicktime can open it, but can't save it. I got another error when trying to save. I'm wondering if it has to with my iMovie version, I'm using imovie HD (6.0), and I think its method of writing movie files is outdated. Is this what my problem is, or is it something else? And while I'm asking questions about iMovie, do the later versions support making movies in 1080p and or custom resolutions?