I copied the file into my MakeMKV 1.7.0 data directory and ripped the DVD again. This time it worked, but with some warnings.
I also notice there is a v1.7.1 available. I'll try the problematic DVD with that version too and see if it works (I'll remove the file from the MakeMKV data directory first)
MakeMKV v1.7.0 win(x86-release) started
Debug logging enabled, log will be saved as C:\Documents and Settings\Jaco/MakeMKV_log.txt
The new version 1.7.1 is available for download at
http://www.makemkv.com/downloadUsing direct disc access mode
Title #0 was added (50 cell(s), 3:27:13)
Title #1 was added (50 cell(s), 3:27:13)
Title 2 in VTS 1 is equal to title 1 and was skipped
Operation successfully completed
Saving 1 titles into directory M:/Video/AWESOME_80S_VOL_2
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 47347712, attempting to work around
DEBUG: Code 86400000 at )fq4!RefZ;J!R;X/. a:29393700
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 79755264, attempting to work around
DEBUG: Code 86400000 at )fq4!RefZ;J!R;X/. a:29393700
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 115251200, attempting to work around
DEBUG: Code 86400000 at )fq4!RefZ;J!R;X/. a:29393700
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 157571072, attempting to work around
DEBUG: Code 86400000 at )fq4!RefZ;J!R;X/. a:29393700
1 titles saved