Best way to explain … →
The BP is set up properly so … >_>
I just don’t know.
Good point although it is both and I believe I have built it but haven’t check to see if it was gone. Will in about a half hour. 
Are you using static lighting or dynamic lighting? If it is static, have you built the lights?
Wish it were that easy, unfortunately it isn’t that.
Hello W4R-G4SM1C,
What you are seeing is normal and is the expected outcome of what happens when you apply a landscape material without any texture applied to it.
When you create a new landscape material and apply it to your landscape, it is filled with the default first texture. This is just a visual cue to let you know a material has been applied. As soon as you begin painting on your landscape with whatever layer you have selected, that component section of the area begins to compile shaders, and then the surrounding sections where you were painting are black when the compiling is finished.
Black Layer Paint
All you need to do is continue painting and filling in the areas that you want to have that certain texture. After you have done that you can continue to paint and blend your textures with one another. Keep in mind I filled in the black area with a tool strength of 1.0 with the rock texture so it would not have missing information. Then I began to take my other textures and blend them with the rock.
Blended Layers
Because I am using three layers (rock, grass, and moss) I will not paint over all three using a 1.0 tool strength. Doing this can cause a conflict of weights and can also cause some blackness to appear. To fix this, just erase the layer you don’t need in that area and try re-painted that section with the desired texture.
Here is how I also set-up my Landscape Material using a heightblend
Thank you and I hope this helps resolve your issue.
that’s not it, when you zoom in you see the normal map coming up from the two textures in the first pic it will show you.
I know the blackness comes from unpainted land.
In the <3 U pic you should be able to see that I have rock underneath the grass but black shows up under the grass. I applied snow over top to cover some of the black although this looks really horrible after the map is all finished.
I was thinking about setting up some foliage to see if it would look good to cover it but then it would be like the snow, with snow every but shrubs and grass…
Have you tried erasing all the textures on the landscape where you are seeing the blackness?
Select each layer, set your tool strength to 1.0 and erase over top of that area. Then attempt to re-apply a texture to see if that fixes your issue.
Could I see your landscape material in the Editor?