Hi! I spent almost 3 weeks trying to solve a problem with iMovie and HD video editing. I had to do a tutorial video for work, in HD (720p) So I had the voice and the video, I just had to put them together and Windows Movie Maker was being... I had issues with picture/video quality with iMovie 6 HD, until I came up with a solution: http://rodolfohernan20.blogspot.com/2012/12/how-to-make-high-quality-videos-with.html I hope there's no problem posting a link. I don't usually do that, however if there's a problem I'll just post the entire solution here. I hope it helps someone!