I'm running Parallels 3.0 on a Mac Pro with 3GB of memory installed. When I play Windows movies in Windows Media Player they play fine. However, when I try to preview the same clips in Movie Maker they won't play -- I hear the sound but there is no video. I can imagine that this is an overlay problem, but is there any solution or workaround? The same thing also happens in other movie editing apps with preview -- for example, when I use TMPGenc's preview mode I also only hear the audio, the video is not displayed.