There are several things you will need to do when you activate FC... much of it has to do with lighting, and most of it has to do with your non-colour info images, such as bump maps and trans maps and spec maps, etc... anything not giving poser pro colour information needs to be modified in the ImageMap node itself. When you click on image_source, you will see additional options... which is where you need to set the radio box option Custom Gamma Value on and put 1.00 in the text box.

There are entire threads on here about GC and this issue, as well as lighting issues, which I'd rather let someone describe that is better versed in the subject.

Monterey/Mint21.x/Win10 - Blender3.x - PP11.3(cm) - Musescore3.6.2

Wir sind gewohnt, daß die Menschen verhöhnen was sie nicht verstehen
[it is clear that humans have contempt for that which they do not understand] 

Metaphor of Chooks