Here is just an idea as I have only been converting for a short time. For the movie Star Trek Into Darkness, it wouldn't recognize the main title due to pathplayer. Even though this may be a different problem, you might try this.
Open DVDfab, go to your common settings, I believe it's under dvd tab and disable pathplayer. Restart DVDfab and try again.
Just an idea from a problem I had. Let me know if it works.