Why is my dialogue track drifting out of sync?

I have a 5 minute clip 1280x720 - I am using Apple Pro Res 422 and H264 - Clip plays beautifully in the timeline, but when I export the clip as a QuickTime Movie, self contained and NOT recompressing frames, the dialogue track drifts out of sync after 60 seconds. I am approx. half a second out by the end of the clip. HELP!!!

It's a little unclear. What format is the clip (Codec, and audio sampling), and what format is your sequence? If your clip or sequence are h264, that's probably the problem. h264 is not suitable for editing and sources should be converted to a fcp friendly format before editing. Also, all source audio should be 48k 16bit aiff with your sequence audio settings the same.

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