HELP- Glass turned black after adjusting ray trace settings?!

I’m not sure what happened here. This is a practice scene I was using to learn Vray so I thought it would also be good for testing Datasmith.
Everything imported fine. I’m still working on fixing some things which didn’t translate in the process.

The first image shows how the glass was looking when I first imported the scene into Unreal with ray tracing on.

In fact this is how it looked before I shut down the computer and opened the file the next day to get what you see in the second image!?

What’s odd is the glass material itself still looks ok.

Any ideas?