i got a really strange problem...When I play music thru the 360 (CD, of HDD, streaming from PC) My sub is not working. This problem just started. The optical cable is pluged in I can see the redlight so I know its working. I have the audio setting set for Dolby Digital on the 360. When I watch a movie or game trailer sub is working great, but When i play music its like the signal is not being sent. I also, in the middle of a song, went to the system blade on the 360 and changed the audio output to Digital Stereo..and whata know the sub starts thumping again. Switch it back to Dolby Digital, where it has always been, no Bass...just very tinny music. I see my receiver is getting the Digital signal because it is indicated on the receiver. Ive had the system since day 1..it did go back for repair in NOv '06 due to the red lights of death, but since then its been great. So... has there been an update that changed something or does my BOX need repair again?? Anybody else have this happen???? Im stumped.