Has anyone had any luck feeding the spdif from windows 8.1 into a receiver? I can choose the output but get no sound at all. updated drivers, tried everything I can think of

I just built a monster gaming htpc (running solid at 4.6) and the only challenge I'm having with this board is the SPDIF. I've got it feeding into a Denon receiver but I get no sound at all. Receiver is configured correctly. I can see the light is...