www.makemkv.com

Well, ok. It's the correct region, it has worked flawlessly with many other DVDs and MakeMKV so far (thank you).

I'm not sure that there is better/later f/w for that drive (wasn't last time I checked). My other drive (only DVD) is set to Region 1 - it fared no better. Identical error.

I suppose I ...

Odd DVD: plays fine on standalone player, can't be played by VLC on laptop but plays with WMP.
Complex multiplex encountered, seems fine, but always fails when attempting to save selected title to MKV file.
Debug file created, link attached.
https://www.dropbox.com/sh/locxtplxdcuhl14/ULH-3ZgLXY
Help ...