Won't Change Back to Regular Audio After Setting "Encoded Digital Audio"

I have a first generation Mac Pro, and I've just recently upgraded to Lion. I used to play a fair bit of DVDs on the computer, but recently I've slacked off doing that. Today I popped in a DVD to play and then opened DVD Player up. Everything worked fine as it was supposed to. I've got the DVD player set to send digital audio out so I can get surround sound through my receiver. When I quit DVD player I don't get sound anymore through the optical out unless it's encoded digital audio. I've had that problem before, and to solve it I'd go to Audio Midi Setup and change the format to what it was prior to being set to "Encoded Digital Audio" by DVD Player. However, now with the upgrade to Lion it will not switch back. The option to do it is there, and I can click on 16, 20, or 24bit audio all day long and I won't get audio output from that port unless I restart the computer.
This is obviously a system bug that needs to be reported to Apple if they aren't aware of it already, but what I'm wanting to know is how can I avoid restarting to get audio back? Restarting Core Audio doesn't do the trick as I've already tried that.

From the iPod's Main Menu choose Videos -> Settings and make sure TV Out is set to Off.
Otherwise, try a hard reset as well. To do this, press and hold both the Select (Center) and Menu buttons together long enough for the Apple logo to appear.
B-rock

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Macbook Air > Mini Display Port to HDMI converter into Onkyo Receiver > HDMI Out of Onkyo into Panasonic TV.
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I was getting stereo fine, but not 5.1 (options grayed out etc). You were on the right track; I unplugged the TV which opened up all the multi channel options for HDMI. Turns out the HDMI out settings in the receiver were set to pass Audio to the TV. So the Audio Device Settings on my Mac viewed the TV as the destination device. But as the TV only supports stereo, that's all I could select through Audio Device Settings and VLC etc.
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Note:
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