okay, every single film i'v played on my laptop, has played fine. but nearly all BBC documentaries (Human Planet, Life, Wonders of the universe) are playing back choppy, including the sound. everything displays fine but the actual playback is as if its playing slower than 1x speed - not by a lot, but enough to be unwatchable. these blu rays played perfectly fine on my ps3.. what gives? anyone else have this experience?