Mac mini 2011 HDMI audio issues

What are the known issues with HDMI audio with Lion and the new Mac minis?
I'm in the process of swapping out an older Mac mini that was connected to my home theater (Pioneer SC-05 reciever, Pioneer TV), with a new 2011 i5 Mac mini.  The old Mac required use of a minidisplay port to HDMI adapter, and a toslink adapter to get audio to receiver through an optical cable.  Previous setup was working fine, but with the new 2011 Mac mini swapped in with the direct HDMI connection to the Pioneer SC-05 receiver, I'm not getting 5.1 audio.  The video is fine and is being passed through to the TV, but the receiver is only doing dolby prologic audio, even though the movies are Dolby Digital 5.1.
I'm using Plex .934 on the Mac.  Audio on the Mac is set to HDMI.  Plex is set to Dolby (AC3) digital capable receiver, etc.

Hi All, I have the new 2011 macmini to replace the 2010 version. I had issues with HDMI sound as well, but it turns out the issue lies in having AND the HDMI cable in AND a toslink/headphones cable.
In the 2010 version you could select the Sound output to go via HDMI or Analog.
In the 2011 version (if you have plugged-in a cable in the headphones) the HDMI sound output is impossible to choose. It is only selectable when you have unplugged the headphones cable. So what is the use of the Output settings if you cannot select anything if you have more than 1 output.....
The guy form AppleCare told me this is a firmware bug that 'should' be solved.....
When I unplug the headphones and start a movie in Movist, I have DTS and DD. With VLC it does not work, but that has to do with the upgrade to Lion (see the VLC forum).
I assume the firmware upgrade will come soon otherwise I will be VERY dissapointed in Apple quality this time and will certainly stop buying new Apple gadgets when they come out. As this was the reason why I switched from Microsoft to Apple......

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