This will sound odd, but I had the same problem with my Pioneer 563 DVD player and Sony Receiver. I found that if I switched from a DVD to a DVD-A or SACD (or vice versa), I would have the same problem you have. Now, if I turned the DVD player off between the DVD and DVD-A (or vice versa) I had no problem. It seemed to be a switching problem when I wanted the player to switch between the multi-channel and digital outputs. Now when I tried the same thing with a different 563 DVD player and a Pioneer 912, I didn't have the problem......odd.