I was watching it tonight on a VS Ultra sending audio via optical to an AVR...no problems. Also checked MPEG audio (apid 36) direct from Traxis 3500 with no problems. There does seem to be something unusual about this signal though because it's real picky about which codec is used for audio (and video) on the computer, but it's alway been that way for me. Did you try a hard boot on your receiver? That usually clears up audio problems on the Ultra.