On a similar note some of my students uploaded videos for their Computational Artifacts. I saw the videos before they were uploaded, but once they were submitted as final I can't play them. On some I get audio in a Windows Media Player, on others nothing... I returned them for technical difficulty, but I don't know if it's my player that's not cooperating, or if they won't play for the scorers, either. I know at least one was a .mov file. Thanks!