Hi,
I recently updated my iPod Video to the latest software update 1.1 using the iPod updater utility and was having playback problems with my MP4 video files. Prior to updating the files played flawlessly so I know it was not a compliance or compatibility issue. The problems consisted of frame freezing and loss of audio during playback. In order to fix the problem I had to restore the iPod to it's factory settings and reload the original 1.0 software that it shipped with as well as having to reload the iPod itself with my entire iTunes library. I would suggest iPod users upgrade with caution. I am using Windows XP, if any other users have upgraded with or without problems please share your findings. Thanks - GMaq