Thanks Hector,
I only have default and SPDIF bypass as options, no DTS SPDIF-in Decode. If I go into the volume control SPDIF is permanently muted and I cant unmute it. Is that anything people have come across?
EDIT:
Solved it, it appears I have to have it set to default but I had to un-enable digital I/O before changing it. Cheers.
Adrian