I'm having a really strange problem with AC3 audio.

I encode my audio using BeSweet (using 192Kbps 2.0) and author using DVD-lab. After authoring the DVD, I played it in my standalone player, and the audio was out of sync right from the start.

I played it in PowerDVD and WinDVD. In both programs, the audio is in sync, but when I fast forward, rewind, or change chapters, there's no audio at all. The only way I can hear the audio is when I play from the start and let it continue.

The strange thing is that I authored a DVD with AC3 audio last week using the same programs and it worked perfectly (the audio's in sync on the standalone and both PowerDVD and WinDVD, I can hear the audio after changing chapters or shuffling through the video).

I tried downloading the latest BeSweet files and put them in another directory. When I reauthor my DVD using the ac3 file that the newer BeSweet made, I play it in WinDVD and get no audio at all. When I play it in PowerDVD, the video plays really fast (and there's no audio).

Any ideas as to what could be causing this problem? I figure it's either BeSweet or the way DVD-lab is handling the AC3 files.