PAL subclip out of sync when placed on NTSC timeline?

The job: 700 adverts from PAL and NTSC from 40 U-Matics - choose 300 and make an NTSC DVD compilation.
I converted the tapes to DVCPRO50.
I created subclips for each ad on each tape.
I created a new NTSC DV timeline and placed the subclips on the timeline.
(I planned to use Nattress Standards Conversion to convert the PAL subclips to NTSC).
I noticed that the PAL clips' audio cut out early. I displayed the audio waveforms for the clip - the waveform wasn't cut off - it was in sync with the end of the clip, Final cut was playing the audio late and cutting it off to match the video.
I exported the edit (to check if there was a delay in the playback of the audio on my machine), the actual output had the audio out of sync too.
When I exported the subclip as a QuickTime movie and reimported it, placed this new PAL movie on the NTSC timeline, the cut off didn't happen.
Surely the subclip and the exported QuickTime movie should behave the same on the same timeline.
Has anyone else had this problem?
Is this a known bug in Final Cut?
G5 2x2.5GHz   Mac OS X (10.4.7)   FCS 5.1.1

How was this clip imported? If it was captured/ingested, did you make sure that the sample rate of the capture settings matched the sample rate of your audio? Normally FCE will give you a warning if they don't match, but it can't hurt to make sure.

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