Problem with back plate and refractions

[si miller]

Hi all.

Can someone help me. I am rendering a simple scene in key shot 4.3.18.

Reflections and refraction's are all good when using Lighting Environment, but when I use a Back-Plate image, the black refraction's appear.

Any ideas?

Cheers
Simon

[PhilippeV8]

This been noticed a few weeks back as well.  Work-round: take your second render with a clown-pass, then composite it on top of your first render in post.

[si miller]

Cool - will do that.

Thanks Philippe