I’ve been able to verify what I am seeing is a mac only bug if you are running OS X 10.10.x. So that explains part of it. They have replicated the issue and hope to get it fixed by preview 3. Here’s hoping. Have you tried to use this system with non-landscape objects? I have tried but no luck. It would be handy to be able to spawn grass on some static meshes as well…
J^2