Lighting is standard Poser lighting, rather than IDL.  Two point lights and a spot, all using raycast shadows.  I'm not using gamma correction at all.  It's turned off and all textures are set to inherit gamma settings from the render settings.  I have normals forward checked everywhere it is available in the shader I've set up, but have tested turning it off, without any evident effect, while trying to solve this problem.

There could very well be some problems with the hair object normals, but I have no idea how to identify or fix them, if that is the case.  :unsure:

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Cage can be an opinionated jerk who posts without thinking.  He apologizes for this.  He's honestly not trying to be a turkeyhead.

Cage had some freebies, compatible with Poser 11 and below.  His Python scripts were saved at archive.org, along with the rest of the Morphography site, where they were hosted.