Weird. Have you checked the Windows mixer (soundvol32.exe, the thing you get on right-click on the little loudspeaker symbol in the system tray) if it's muted or the volume turned down for the Wave output? Maybe it got confused. In addition, there is the Realtek HD Audio Manager in Control Panel, which is basically the same as the Windows mixer, things can get muted there as well, plus IIRC the two mixer applications may interact with each other in an ugly way.
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