I have recently changed the way I encode divx movies, which results in better quality movies at lower bit rates and smaller file sizes. But I sometimes get playback problems, like the bottom half of the screen sometimes flashes for a second or two, then breaks up. I usually encode movies at 720x432 or 720x576, with a bit rate of 1000 for good movies and 800 for others. I use DivX6 with Virtualdubmod with settings for first pass at: Home Theatre Multipass, 1st Pass 1000 Balanced (Default) SSE4 Full Search Disabled Enhanced Multi threading enabled for Intel Quad 6600 ASC @ 250 frames Format in PAL 16:9 out PAL 16:9 H263 Optimized IBlocks disabled For second pass I change rate control to Multipass, Nth pass with insane quality then encode video. The problem usually arises with movies at 720x576 resolution. I don't use any filters, i just crop 72 from top and bottom for 2.35 movies and don't do anything to full screen movies. I play my movies on a samsung dvd/divx player to watch on LCD and have never had any problems until now. Should full screen movies be PAL 16:9 or PAL 4:3? Has anyone had any similar problems to this. I have tried experimenting with format in and out. But no luck! Thanks.