You certainly have talked about this before. I'm so annoyed at myself for not realising what I'd done here - I've been chasing my tail over this.
I had everything set up with no GC, a much lower SSS value (0.4) and exactly the diffuse colour maps I wanted...but I kept getting those dark areas. I'd even set up the EnvSphere so it was adding just a little more saturated cour from the environment.

 

PoserPro2014(Sr4), Win7 x64, display units set to inches.

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