Terrains are showing up as black in viewport and when running

$$anonymous$$ake sure you have some kind of light; check textures and verify you don't have a black texture assigned to terrain; go to Inspector for terrain, under Terrain (script) click the gear, take/post screenie

After playing with some of the rendering settings, it seems as if the new terrains are using a splatmap from an old terrain, and I cannot paint over it.

I also attempted copying a terrain asset in the explorer and that's when things went bad, if that helps.

So you are getting some parts of the Splatmap but not all. Is the texture for this terrain that corresponds to the blackness a.o.k? Have you been playing around with any scripts or assets that modify terrainData?

I use Relief Terrain Pack 3 (RTP3), and you can use splatmaps for different layers. I recognize the non black part is using a single layer splat map from a different terrain that I textured with RTP3. But it's not even using the diffuse texture I set in the terrain, nor can I paint and have any texture show up. I don't know what else is wrong, I'm not using any script when I create the terrain, that's just how it shows up now.