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UE: 4.18.3
HammUEr: Latest

Followed official tutorials and some 3rd party, used provided base/decal presets.
Materials/Textures doesn't work in CS:GO maps.
Props/Maps etc works fine.
They show in HammUEr: 

But...





i got the same problem

That looks like a base material problem. 

Open your base material and check to see if it says anything about errors there, there might be a broken texture reference there you have to fix before it'll actually render.

The BaseMaterial had error for missing texture in NormalMap, so i added flat_normal there and saved. Importing again, will let you know if that solved the issue.