Audio drifts out of sync with video

Hello --
I just watched the pilot for Conviction in iTunes on my PowerBook. The audio was just fine at the beginning, but by the end of the episode the audio was about 2 seconds behind the video. Everything on my system is up to date (OS, iTunes, Quicktime). Are others experienceing this and can it be corrected. I tried just pausing the video and restarting it but that did not correct the problem.
HELP! (and thanks)
-- Steven

so new versions of iTunes have seemed to correct this problem.

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