I am also having problmes exporting my film and having the audio synch with video. It's fine on my IMAC (brand new, fully decked out for video editing) but when I go to export it's really bad. I don't believe this is an isolated problem. I have exported for years, no problem no matter what I have in my films. We should simply be able to export our projects. Now I am stuck having only the back up on my external drive and not a cogent copy on exported film. I need an instant fix and have no time to fiddle with experimentation. If I am having the problem plenty of others will --that's usually the case. The person having problems with his audio-video synch --don't believe it is an unusual problem! Many of us are having the same trouble. Perhaps, Adobe will send us a patch ASAP.
What is your Source Material, your Sequence setting and your Export settings?
Ource: mixed film VTBS and MTS. Sequence is 29.97 640 x 480. Export to tape.