Try this:
1) in DVDFab Settings, disable Cloud Decryption for DVD, restart DVDFab and try again.
2) If 1) does not help, also in Common Settings, disable PathPlayer.
If one of the above works, check playback carefully before burning to disc. If neither works, use the Feedback button in the Settings dropdown to send the files to the developers. Include a link to this thread in the Feedback report.