Didn't work.

The thing seems to be more of an overlay, anyway. When I tried your suggestion, what I could see of the terrain paint under it went away. And as the camera moves, different parts of the ground underneath "poke through" whatever the hell it is.

Yes, well, I downloaded a lot which has me rather worried. I've checked, and all EPs and CC are secure and in the right place. And yet, I have this:


I'm not so much concerned with fixing it (I can live without using that lot) as I am with why it is happening, is it a warning sign of BFBVFS, and how I might prevent it in future lots. And yes, I have tried taking out the lot and reinstalling it.