Why is my video exporting out of sync with the audio?

Every time I export it (and it takes some 2 hours just to export a draft version) the video is sped up, but the audio isn't, so that the video is out of sync and at the end there's just black space with the end of the audio.
Both the video footage and the composition have the same frame rate (24p). I am exporting with Render Settings set to DV settings and output module set to Quicktime DV NTSC 48kHz
When I edit it I've been timing it to the seconds and frames because it's such a large file that I can barely RAM preview 5 seconds of it, and so it's especially frustrating that it's completely off when it exports.
Has this ever happened to anyone here?

Ahhh, right.
I'm using After Effects CS5.
The footage I'm using is in .mov format, although to be honest I'm not sure about the codec  (I imported it straight to After Effects from my Canon 7D's memory card? I think it's H.264)
I also have some PNG sequences.
I used the AE Render Queue.
The computer I'm using runs OSX.
  Processor Name:
Quad-Core Intel Xeon
  Processor Speed:
2.8 GHz
  Number Of Processors:
2
  Total Number Of Cores:
8
  L2 Cache (per processor):
12 MB
  Memory:
4 GB
  Bus Speed:
1.6 GHz

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