Audio loses sync after rendering

Imported clips from FCP capture scratch. Adjusted length of clips with motion. It plays fine when reviewing work but after rendering, about 7 seconds into the piece, the snyc is non existent. What have I done wrong?
Pb 17 inch 1.5 ghrz processor, 2 gigs ram, MBP 17,2.33ghrz 2 gigs of ram   Mac OS X (10.4.9)   30 GB IPOD FC Suite, QT7, 3 LaCie extreme 200, 250 & 300,

yeah, I went back, trashed the original, captured everything in a sequence from FCP sent it to motion, added other effects and it worked fine. Some things you can do, some things you can't. Seems as though motion really did not like me importing the clips as quicktime, then modifying the duration in motion. Extra step still don't have a clue as to why I did it that way except the clock did read 4am! Hmmm....could be the answer.

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