That's great that the 604 likes all your files. Wish I had the same luck. I'm also running a network media player (DSM-520) and that's where most of the sync problems occur.
And I also have a Neuros OSD as my main network media player and ripper, and that one plays most every thing fine like the 604.
Maybe the problem is in the playback device, not in autogk or DVDFab. I know Xilisoft recently upgraded their ripping software to include a check box fo audio/video sync. So the problem does exist.
Maybe it is something in the way the video is transported from the PC to the TV. Whenever I rip a DVD, I always do some post-processing on it to get rid of the stuff they force you watch prior to the menu and then rebuild the DVD before I burn it to disc. I use DVD Remake for this. I don't have a media player like the DSM-520 or Neuros, so I either use the new disc or the Archos in the DVR station to view the content.
I do have a question on the Neuros. If I am reading the Web site correctly, it digitizes the analog video output from your DVD player, etc and then routes that to some recording media like the PC or a PMP. It looks like its more of a "recorder" than a "ripper". I consider a recorder to be like a VCR where the analog video source is recorded real time while a ripper copies the digital DVD file structure that is on the DVD disc. When you record something using the Neuros, what is the format of the resulting video file? Am I missing something here?