Humm. I had an export be out of sync once, but it was about a second. I haven't heard of this issue before. A few questions.
1- If you export a stereo mix (rather than roles), is it still out of sync?
2- how long are these timelines typically that go out of sync?
3- Are you able to reproduce this with just the the countdowns without the program?
4- If you reimport the movie back into FCPX can you clearly see the sync issue?
5- What frame rate? Drop frame by any chance?
6- Is this happening with both SD and HD? Only with XDCAM originated material?
5- What version of FCP, Specs, etc.
when I say the beep is one frame early, in fact it is at the right time code, it is the whole video that is delayed by a frame. From the very beginning of the file as Bars now start at 5:01 instead of 5:00.
But there is no black frame at the top of the file.It is as if the first frame was repeated (difficult to see with a slate though...) and then the whole picture part of the file is delayed by one.