I don’t use DVDFAB a lot, and I only use it on DVDs, not Blu-ray or others.
I have version 13.0.5.1, and each time I eject a DVD and put it back in, with DVDFab running, it picks it up.
So I’m not sure why others have to restart dvdfab or put the DVD in first and then run DVDFab.
If it’s a Windows system, it does have in the Control Panel Use AutoPlay.
Maybe that helps, as mine is on.
I would think all DVD players would be the same, but maybe some are different?
Or if it’s a Blu-ray or other drive, I can’t say.
Hope you get it fixed; they may ask for a dvdfab.log.
If they do they can give more info about that.