I use an optical (manual) switchbox, to feed both the sky+ and dvd player optical outputs to a yamaha amp. When I switched from the dvd player to the sky+ box, the amp was having a real hard time telling what was coming through - the amp front display was flickering between allsorts of signals, and I got no sound at all. When I switched back to the dvd player, everything was (and is) fine. I tried using the dvd player cable with the sky+ box, and still nothing. Checking the back of the sky box, it is sending something out (red light), but nothing which produces sound.

Anyone else had this happen with an Amstrad box (PVR3)?.