So before I was able to get dolby 5.1 from my HD DVD's but now I can't. HD DVD will only output in 2.0 sound, regular dvd's no problem I get 5.1 and it used to be fine before I did the update from playing The Matrix HD DVD for the first time. I checked xbox 360 audio settings, checked my yamaha rxv-658 receiver's settings and still no success. Anybody else ever have this problem? What do I do?