I've recently purchased a LG BD660 bluray player and I've noticed a problem when playing movie files from a USB stick that is specific to the mp4 container type. All mp4 movie files default to playing back at 60Hz, which results in a very jerky picture, if the source frame rate does not match. I've managed to transcode a few of the files to the mkv container type and they always playback correctly at the right frame rate. The problem is specific to the mp4 container type. I've also noticed a similar issue with the HD version of BBC iplayer, content defaults to a frame rate of 60Hz instead of playing back at 50Hz. I've contacted LG support and they say the product may be faulty, I suspect it's more likely to be a firmware issue. I was wondering if anyone else has experienced the same problem?