Ive been downloading mp4 files for a while now, putting them on a memory stick and playing them on my LG Plasma tv without any problems. All of a sudden quite a few of them won't play anymore as when i press play the screen freezes and the file goes back to the menu. I am taking a guess that this could be a codec problem and wondered if there is a way round it. To get the file to play i have to change it to an AVI file which takes time. Any ideas people ?