This problem is doing my head in. I've got a video background for a menu (created in AE 7.0, and put through Sorenson Squeeze to create an *.mpv file) which basically has a 12sec animation of the menu appearing and then another 36sec of montage clips.
I've set the loop point at 00:00:12:00 and set it to loop forever. This works fine in preview mode. Whenever i build the DVD and try it in any player, it gets to the loop point (12sec in) and then freezes.