Everytime I try to watch a movie in either Dolby Digital 5.1 or DTS 5.1 it always defaults to one of the goofy surround modes like Prologic II or something and I have to manually put it back to plan DD or DTS. I have the default set to just stereo on the 990 but it still picks something different every time. Can I fix this or is it something I just need to put up with?

Also i get a poping sound everytime i switch chapters in a movie, is this normal too?