The error here meant that you need to manually select DTS/5.1 (Remove HD) option, correct?
Once I have ticked the "Always remove HD audio" option in "Common Settings > Conversion", I do not have to tick that option manually. Maybe you can uninstall and then install the latest 12.0.5.2 to have a try?
Mona
As I understand "select DTS/5.1 (Remove HD) option" meant if you don't tick that option DVDFab will retain DTS 5.1 audio with DTS-HD MA or DTS:X MA above.
But now need to tick that option if you want retain DTS 5.1 audio with DTS-HD MA or DTS:X MA above.
For Atmos audio, don't tick that option DVDFab will automatically retain AC-3 5.1 audio with Atmos above and vice versa.
This still happens on 12.5.3
I don't need to compress blu-ray discs, I'm only interested in remux blu-ray.