Strange sound/sync problem after encoding in CS4

Hi guys and gals, wonder if anyone can help me out on this one?
I'm running PPro CS4 on a purpose-built matrox rtx2 system, working mostly from DVCAM.
I've done a complete edit, cutting various interview soundbites over music to make a testimonial montage. After doing the complete audio mix, everything sounds fine and dandy when I preview it after rendering. The problem occurs when I output the film using AME to a variety of different formats. Where previously I had precise edits on the timeline, the audio cuts sound to be a couple of frames out. For example, one cut occurs just after the line 'ideal product for our needs' and sounds exactly as it should on the timeline, but on the outputted file it sounds like he says 'ideal product for our nee...'
Same thing occasionally happens on music mixes, when I cut to the beat to use different sections of the backing track and crossfade through, it sounds fine on the timeline but then after I output the file then cuts the sound off the beat and the music sounds like it goes slightly out of time on the transition.
I've even tried rendering it out as a wav file, but that doesn't work either.
Is it something I'm doing wrong? I've checked and it's all 48k sound (and if it was a sample rate issue I assume it would appear on the timeline as well). Or is it another to add to the long list of problems we've had with the matrox setup?
Any help will be greatly appreciated!
Cheers,
Kev

Kev,
Could it be that the preview of the timeline is inaccurate as opposed to the outputted file?
Let's check this out. First, is there a red line above your Clips in the Timeline, just below the Timeline Ruler? If so, hit Enter to Render those Clips for smoothest playback. Note: Audio can need Rendering too. Does this help?
If not, set the WAB (Work Area Bar) over a small section of the Timeline, though one that exhibits the OOS issue. Export to your desired format/CODEC and test. Do you get OOS in the Export?
For a bit more on Rendering, see this ARTICLE.
For a look at the WAB, see below:
Good luck, and please report,
Hunt

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