Two renders in P7. First is with Normals_Forward NOT checked. Second is with Normals_Forward checked. The blackness is where you're looking at the back side of a polygon.

April is right. I haven't fired up Poser 5 in ages, but I just tried it. The P5 render (both Firefly and P4) looked like the one on the left. If you're trying to render curly transmapped single-sided polygon hair with Poser 5, forget it.

If you have turned on Normals_Forward, and you did it for every material zone, you should not get black unless you're looking at something where the Diffuse_Color actually is black, or the light is not reaching that polygon (due to shadows or a spot light not pointing at it.)

If you don't show me your light setup and your shader setup, I can't help you. I can only guess at which of the several thousand things you could do wrong, has actually been done wrong.

Get rid of your figure. Load only a single infinite light at 80%, directly from the front of the hair. Do not cast shadows. Make sure Normals_Forward is checked on all material zones. Make sure the render option for removing backfacing polygons is not checked. Render it. If you think it looks wrong, then post the render and your shader for the material zone that you think looks wrong.

Also, to be sure it isn't just a lighting issue, let's get the shader out of the equation. Disconnect all nodes from your shader and set the Diffuse_Color = WHITE, Diffuse_Value = .9, Specular_Value = 0, Normals_Forward = 1. Render that.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)