I separated my audio from video track so I could copy the audio for the intro and credits. I did this three times. I burned the video and everything was fine. I then added transitions between chapters and the 3 places I had separated the audio from the video were out of sync after adding transitions. It looks like it split the audio between the end of the transition and the rest of the video and then did something to that portion of the audio to cause the rest of that chapter to be out of sync, but then fine again when it started the next video.

Worse is I burned 9 blu-rays and DVD and sent them out before I realized those 3 out of 35 chapters were broken.

Solution: I deleted those chapters, which left a little segment of audio where the transition was, which I had to delete also and reinserted the video again and didn't separate the audio this time. Somehow I thought that if I deleted that separated audio track I would lose the audio on my intro also, but I didn't. That tells me what I should have done was just inserted the video at the end of my movie, separated the audio, copied it to where I wanted to use it and then delete video.

Bug: Don't use transitions with videos you separated the audio from or even better don't separate the audio from your video if you need them to stay in sync. Windows 7 Ultimate 64bit
Velocity Micro
Intel Core 2 CPU 6700 @ 2.66GHz
RAM 6GB
NVIDIA GeForce 8800 GTS v258.96
ViewSonic VX2255wm-4 dual extended display
K-Lite 32bit & 64bit
1680x1050
Windows 7 Basic background no Aero
Hitachi 400gb system dr