I have an X-mystique (stock op-amps, latest driver version 126.96.36.1990) set to Dolby Digital Live output (optical cable to a Yamaha receiver). In the past, running an audio signal to the line-in jack would play just fine through the receiver, but it has stopped working. It will play on the analog out jacks just fine, and I can see the audio signal on the audio meters, but I can't get it to send the signal to the digital output. The mute isn't on, and I know the signal is being seen by the card, so the recording source setting is okay. What I'd like to know is if I have a setting wrong, if another piece of software could interfere with this, or if there's a hardware failure that's preventing this. Thanks!