Had a rummage a bit and I noticed that the Marker in the Master Script calls a Macro called
! call "Detail Worksheet Marker Macro" parameters all A = A,
Only problem is does not seem to exist in the extracted LCF Library file. I did however find a Macro called BaseMarker_macro" and it seems to pull in the Layout Sheet ID but if I try getting the Detail Marker to call that macro instead I get a lot of errors
AC versions 3.41 to 20 (4020 UKI Full)
Mac OSX 10.10.5 Mac Pro-2013 32gbRam AMD FirePro D500 3072 MB graphics