VRay Plane: What is this Pesky Grid?????

Whenever I have a plain white studio scene using a VRay Plane, I notice I get this very odd grid peeking through at my shadow areas:

This has really become a nuisance. I’ve searched high and low, and can find no info on this. Anyone know what’s going on, and how to eliminate the problem? I’m running
IR/LC. Be happy to post full settings if needed…

Does it happen if you replace the plane with normal geometry?

Best regards,
Vlado

Oh, yes. Should have mentioned that. When I replace with a normal Max plane, the problem is no longer there.

Ok then, would it be possible to get a copy of the scene? You can either put it here or email it to me at vlado@chaosgroup.com

Best regards,
Vlado

Thanks Vlado. Email sent to you with a link to the project file.