Unable to paint grass onto surface

Hello everyone, I’ve been having a problem I simply can’t figure out a fix for on my own: I’ve been painting some grass on a floating island static mesh, and everything was working perfectly, but at some point, while I was messing with other things in the level, the folliage painting tool stopped working. I’ve tried painting on a different surface, like a simple plane, and also tried to paint a different mesh, and the tool still won’t work, leading me to think it’s probably something to do with some setting I’m missing on the folliage mode panel.

Any help would be greatly appreciated!