Shader Mixer - Caustics

tomsfo1

Good morning, need a little help, please. I’m trying to duplicate the instructions on Caustics in the YouTube video DAZ Studio Advanced Rendering Part 1;

Realizing this video was made with an older version of Studio, I was able to follow the instructions perfectly, until I get to around 4 minutes 30 seconds into the video. When I click on “Apply” in the Shader Mixer for the Caustic Surface, nothing happens. I’m using DAZ 4.8. I have repeated the steps/process several times with the same problem.

Interesting, when I click on "Apply" the pane does not close, but I do have the Caustic Surface for the sphere in the Surfaces. When I attempt a render, it lasts for just a moment, and the result is a blank render.

Can anyone help me define the problem; or identify why “Apply” is not apparently working and the pane does not close? Please see screen shot, indicating all the setting are correct. The sphere is selected. Could this be an issue with 4.8? Does 4.8 provide a different way to produce a caustic rendering?

I did search the knowledgebase, forums, Google and YouTube using various terms. In fact, I found little on the subject, almost nothing on caustics. Your assistance is most appreciated.

Thank you for your time.

Tom