Wondering if anyone else has run into this. . .I got a copy of the DVD-A edition of Deadwing. The DTS and PCM tracks are fine. But when I play the DVD-A track, it's silent. It *looks* like it's playing; the proper screen comes up and the timer runs, but there's no sound. (Other DVD-A discs are working fine.) Is this most likely a defective disc? Is there any history of compatibility problems with certain discs on certain players (mine's a Pioneer DV-563a)?