Okay, here we go . . . .

As mentioned previously, hborre accurately diagnosed the issue. Mr. Taylor at Poser Support, recommended replacing the Alternate Diffuse Node to Glossy BSDF, which I have done in the modified shader for Aether Hair. It's not QUITE the right color, and it's not shiny enough, but I'm sure someone here will recommend a change that will make a difference.

Thank you ALL for contributing to my knowledge.

:)