No audio through HDMI

Hey there. I'm running Eden (11.0, compiled 3/21/12) on Win7 64-bit SP1 build 7601. My PC is sending HDMI out. The sound works fine elsewhere in Windows, but not in XBMC. Sometimes it says "failed to initiate audio device." The motherboard is ASRock A75M-ITX. I've tried every combination of Audio Output settings I could find, to no avail. Next step?

BTW: I'm running debug, but I can't even find my gorram AppData folder. I hope I can be allowed to live.