Black Frames when rendering RAW

I am trying to render some Environmental fog effect in DeepEXR but the instant I click on “V-Ray raw image file” my renders just turn black.

The photon map calculation still takes place, but the whole frame…is just black :S

Using Max2022 with Vray 6 HF3

Odd. Does it happen when Deep rendering is disabled? Mind if you attach a simplified scene (or send) so we can take a look?