You need to either use a configurable ac3-decoding software, or use windvd, then go to options, and choose SPDIF out, rather than software decoding. This will send the raw digital signal out over the optical cable, rather than what you're getting right now, which is a downmixed PCM signal.
PCM= Stereo
AC3=Compressed THX or DD
I'm having similar problems, but with everything OTHER than movies.
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