I've noticed the same problem with my 970 and the hi-def cable box. I'm running component from the box to the TV and optical from the cable box to the 970. I also have the analog stereo output from the cable box running to the TV also. With both the TV audio and 970 audio playing there is a noticable delay through the 970. I know my lip sync is zero and my distances match what I measure.
If you have both the TV speakers playing (fed straight from the cable box) and the 970 playing (fed from the cable box's optical output), I would assume you also have speaker distances set in the 970. If you do, those distances are a form of delay. The TV isn't applying any such delay.
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