Volume grid and IPR

[YoyoBoy]

I'm playing along with this video - https://www.youtube.com/watch?v=EHxMDbSgfM4-. It's working fine, but in the VRay messages I'm getting the errors below

And when I switch to CPU, it works fine when I hit the main render button, but when using the IPR the grid doesn't render at all, and I get the message "warning: Failed to clone atmospheric effect 'VRayVolumeGrid'. It will not be used in IPR"

Is this normal?

Thanks.

[hermit.crab]

All three messages are normal and you may ignore them in this scenario - a current limitation of the CPU IPR is its lack of support for volumetrics; Fire Lights (Fire Rollout) and Use Light Cache (Smoke Color Rollout) options are currently not supported with V-Ray GPU.