I installed my new Sound Blaster ZXR today, and have it connected to a Pioneer Amp with 5.1 Paradigm Cineman monitor speakers via SP/DIF. I'm running it in DTS Connect mode, and will probably switch to analogue cables soon to get the best audio quality.
However, in the meantime I'm sticking with SP/DIF and DTS connect - note that my amplifier is 100% DTS compatible. I've had some really, really strange problems with the ZXR - at first the speaker test works fine, and each of my 5.1 channels is assigned correctly. After about 30 minutes of gameplay, it then swaps all the channels around - the front left test signal comes from my left rear, the front center comes from my right rear, etc, etc - it's all over the place, totally destroying surround sound. At the same time, the audio signal gets really distorted and fuzzy. The only fix is a reboot. I've tried setting everything to default values, as well as updating to the March 3 drivers and rolling back to the driver disk. The same problem seems to happen when I'm running in headphone mode, with ingame sounds that should be coming from the left now coming from the right.
Any ideas? I'm at a loss - it all appears to be setup perfectly, and this is not my first soundcard. It's my fifth actually, and I've never seen anything like this before. Any advice you can give will be most appreciated.