in the AP workbook I'm doing the 'Mam Tor' exercise starting at P.138, and have the .afphoto file loaded next to it for comparison. everything looks exactly the same as the snapshots in the .afphoto, up until when I get to the 'more tonal tweaks' part. mine, with exactly the same settings (checked it twice) I get a far more dramatic 'cold' look then what I see in the correspoinding snapshot of the .afphoto file. I even downloaded the source files again to be sure they were not compromised.
Are the effects of the Selective Colour Adjustment Layer stronger in ver. 1.7.1 than what they were at the time the book was made perhaps?