Hi, grumps56, your log is DVDFab 10.0.9.2 (2018/06/09 08:25:43) (X64) and it shows "SubMode(Remux) -- Display Only forced Subtitle(false)".
Please download and install DVDFab 11.0.1.7 at http://www.dvdfab.cn/download.htm
Then load the disc into Ripper option, choose MP4 profile, in the Audio column, select the subtitle track which contains "forced subtitle" and choose "Display only forced subtitle", then click on the wrench button to open "Advanced Settings" window, in Subtitle part, go to Mode, choose "Direct Render to video" to convert.
Still fails, please send us the latest dvdfab_internal log, thanks.