[jpsdr]

The receiver should be listed in MonInfo (see my sample) - if not, are you connected directly to the receiver??

Yes, i am.

But, i've searched and found the VSX-921 specific forum, and just have to get a rope to hang me...
Because i've found this...

Well, no realy...
It's not as if things were not working. So maybe the issue is somehow more complex...
But maybe it's because of nVidia + VSX-921...

Edit : It seems to be related to 3D support, so, no rope.

The facts are :
a : HDMI audio VSX-921 is selected as default audio device in windows.
b : Property of audio device report 8 channels.
c : No issue with chipset VIA with MPC-HC and VLC.
d: No issue with chipset VIA with XBMC just before AE merge selecting Wasapi VSX-921.
e : Obliged to disable chipset VIA in BIOS to have audio from non pass-through formats since AE merged because even selected Wasapi VSX-921 the device seems not be used.

I am realy the only one to think that a+c+d => issue of e is more probably on side of XBMC + new AE ?
And if there is realy a little something (a problem in initialisation or else), maybe it can have some side effects...
If i insist on this point it's not because i absolutely want my VIA back, it's because, according the facts, i think there is some kind of issue in the air; and if there is an issue, it's better if solved.

As said, i can add in the code more log information and compile a special test build.

If EDID information were wrong, reporting only 2 channels, shouldn't also the point b be false ?