I assume that the surrounds work in other modes, and there is no problem with connections downstream of the 950. According to a quick google search, the disc is listed as having a 5.1 DVD-Audio track.

So you have five speakers plus a sub, right? You should not be using the surround back speakers at all (in fact, I'd turn them off in the speaker setup, although that shouldn't make a difference when using the 6-channel analog input). I'd definitely check to make sure all of the cables are hooked up well (I had a couple of cables come loose from my amp when I was hooking it up, which can be a real headache).

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