This is an ancient thread, but I wanted to post an update in case anybody else finds this through Google. This post:
Helped solve my problem. Biostar H77UM3, Intel G540. Could not get any sound out of Winamp, Chrome, Foobar, etc, to my Pioneer VSX-821K. MPC-HC worked flawlessly to bitstream to my receiver but wouldn't play MP3's.
Turns out I had to set my "Speaker Configuration" in Windows to Stereo to get things working. I'm running a 3.1 at the moment but 3.1 breaks almost every other audio program on my computer. 24/192 in advanced, no problems now.