I have the same problem with my Sony Bluray player.
Funny thing is that I have both HDMI cable and analog cables (because of the link rooms). CDs works fine in all link rooms, but not in the living room.
I have tried many alternatives in the setup menu, both in the 10-40 and the BDP, but still no sound from my speakers in the living room.
BV10, Avant DVD, BL5, BL4000, BS2300, BV6-26, MX 4002, 2xBeocom 6000, LC2