CS4 upgrade trashed sync

Upgraded to Flash CS4 from CS3 last week and now the animation I was working on is out of sync with the sound. Badly. What really creeps me out is the rough cut Shockwave file I made – that worked perfectly on my machine and one other – now runs out of sync too, when I’m not even in the program.

I have sync for the soundtrack set at “start” with the last keyframe set to “stop”.

Anybody with any ideas? You would be a godsend. I’m kind of a newbie, or rather a relearn-Flash-every-two-years-since-who-needs-to-animate-that-often-bie.

Thanks!

Tom