Trouble getting "subtitles" to copy

The movie

Thai horror film - Regin 1 DVD, features
original Thai language track
or
dubbed in English track

DVD comes with English subtitles option for those that choose to listen to the Thai language track.

PROBLEM - can’t get DVDFab to rip Thai language WITH English subtitles

Doing a DVD - DVD and then DVD (off hardrive) - PSP I get only the lousy English dub version.

Doing DVD - PSP mobile Option directly, I get only the Thai audio track - but NO English subtitles, despite checking the English subtitles box in the DVDFab menu prior to ripping.

What am I not doing?
…Have re-installed the latest Fab version btw.

Thanks