I have a WD TV HD which I used on my Sony surround fine. I’ve connected it up to a friends system ‘Panasonic SA-PT467’ surround DTS and when playing HD AC3 files through his Panasonic, audio is fine but play a DTS file, no audio at all. These are going through Digital out via optic lead. Is anyone else having similar problems. The Panasonic SA-PT467 has DTS and as I said the same files work fine on the only DTS system.