I understand you, isaacnewton;  we just need to know what the material structure is in order to try to get you a more satisfying preview.  ^^

First try BB's advice; try less aggressive preview settings, and add a wire from the texturing image map to the diffuse channel, being sure to set the value low.  I do this frequently to be able to see what would otherwise be a whited out preview.

My guess would be that the lips, nails, etc. are driving the alternate diffuse and alternate specular channels.  This has become more common with DAZ gen4 doll textures.

I don't know what to do about the hair.  The effect is intentional, not an error.  Because it fares poorly in preview, transmapped hair is often set to preview in one of the wireframe modes so that you can easily see mesh collisions.  Control handles are often made visible only in preview.  I find these features very convenient during scene setup, so I've never tried to change them.

Poser 12, in feet.  

OSes:  Win7Prox64, Win7Ultx64

Silo Pro 2.5.6 64bit, Vue Infinite 2014.7, Genetica 4.0 Studio, UV Mapper Pro, UV Layout Pro, PhotoImpact X3, GIF Animator 5