I’m having almost an identical issue here. I’m using an imported Tiled Landscape. I was getting the same error message, I fixed the tile sizes and what not, hit resimulate and nothing shows up… not even the error message. When I paint the foliage only a couple logs show up on the landscape. I made it so foliage can be applied on top of static meshes just to check if the spawners were even working in the first place. They were, as all my buildings and other static meshes ended up growing a forest on top of them. I recently contacted the publisher of this asset too, but they’re at E3 at the moment. Is there a fix to this issue yet? Is it an engine bug?