I have JRiver running on a PC outputting to receiver via HDMI. I have no problems playing any and all multichannel files with the exception of some DTS Flac albums (ie: Billy Joel - The Stranger).
JRiver stops dead with these files and tells me it can only play them as 96/24 stereo.
I've tried various settings - at the moment channels=source, Wasapi - Event Style, no change to sampling rates. Speakers set to 5.1 in Win 7.
When i play these from Foobar however the file is identified as 2 channel - but is decoded as 5.1 by the receiver and plays just fine.