Just can't seem to get proc foliage to work on 5.4.

No matter how large I make my overall volume, it gives me the infamous ‘can not spawn instances’ error and I am totally baffled.

If you look at the attached images, the volume totally encapsulates my landscape in all 3 dimensions. So what am I doing wrong?

I DO have certain foliage excluded from growing on rock layers, but that shouldn’t affect the entire map…

Someone has to know how to get around this…