i have the same lip sync problem every now and then with satellite TV and DVD's. what i do to fix the problem is run the auto speaker calibration and then save the settings.. works great.

for about a month or two.. then I have to rerun the auto speaker calibration again. it's only a small PITA though.

this fixes the problem each and every time for me.. sometimes I have to run the auto set up a couple times before it catches though.