Hair looks like smoke

Do I have one of my preferences set incorrectly?  Some hair styles show up in Iray view looking smokey.  When they render, they render solid, but I'd like to see what they'll look like before I hit the render button.

Here's a screenshot of what https://www.daz3d.com/dforce-tara-hair-for-genesis-3-and-8-females looks like in Iray view.

and here's what it looks like when it renders:

There are other hairstyles I've had this issue with, this one is just the latest.  Any idea what I'm doing wrong?