ive heard of this before, however im sorry that i dont remember the cause or the fix.
Please post a couple of items from the burn log, which can be found at C:\Documents and Settings…username…\My Documents\DVDFab\Log. This is a text file that you can open with Notepad and copy and paste a few recent entries into a reply post.
also send the ifo files to fengtao with a link to this thread.
while we are waiting for more replies or a fix, please read the official guide found here. and update to 4062 if not already.
then try again this time with pathplayer disabled and using main movie mode (if already disabled try pathplayer always enabled).