HDRI renders black with reflection refraction on - any ideas or tips?

[markstevens1]

Greetings!

 

Using Vray and 3dsmax, when I turn reflection / refraction environment on everything goes completely black including the HDRI.

 

 

 

The override material is reflective, I have excluded the glass windows and when I turn on the reflection refraction environment from the environment slot in the render setup the HDRI goes completely black. When the reflection refraction environment is turned off it works. I tried increasing the gamma and the multiplier and still no luck :-(

 

I've been using LeonLeon51's (Tom) great tutorial on youtube on HDRIs and the environment

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Does anyone know what I'm doing wrong or missing?

Many thanks!