Is it possible to adjust the position of the audio track in DVD-A relative to the video track? I mistakenly rendered an out of sync project from Vegas into Architect and wonder if I can correct the sync point directly in Architect instead of rerendering the entire project

Paul, there's no option for slipping audio that I'm aware of.
It looks like you'll have to fix it and re-render.
If you're lucky, it'll only be the audio track that has to be rendered again and that's much quicker than a complete re-render.

I was afraid of this answer. I've already tried rendering just the audio track but it falls back way off sync by several seconds. Thanks,

Does it sync up OK when you're playing it back in Vegas?

I haven't tried that. I was syncing it up in DVDA and listening to the playback right there as well. I just rerendered the whole project anyway.

Go back to your Vegas project (.veg) and DO NOT make any changes in the video portion. Slip the audio so that it is in sync and play it back to confirm. Then you should just have to rerender the audio (which is quick) and save it as the same name as the previous AC3 render and in the same folder. Then when you drag the video to DVDA it should bring the new corrected audio along with it.