Hi mike98020
Open Fab click the Click the Green √ at top right corner of the DVDFab screen, and open Common Settings > General >A/V Codec, put a check in Disable all GPU codes and make sure they are set to Software, restart Fab and try again.
Also please do not convert from your drive
First save it to your HDD as BD50 "Movie Only" without compression.
Then open the hard drive folder and use the folder on your HDD to do your converting.
Doing it this way saves wear and tear on your optical drive and is also faster.
CBR929