Brad,
Try exporting Video only (you don’t need Bitvice to do the audio, do you?)
2 things to consider:
Maybe try exporting Part 2 in several segments and joining them later (this will also help identify whether or not you have a faulty clip/render/file and if so, its location in the sequence.)
Maybe try exporting Part 2 with just the base layer, then try with layer 2, etc, to establish what might be causing the problem.
Good Luck.
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Neil Ryan
Post Production
The Pod Multimedia
http://www.the-pod.com.au
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