World Machine to UE4 using World Composition

Hello! Ressurecting this as I have a different type of issue. In the material setup part, I followed every step to the letter but my material remains desperately black, anyone could tell me why? Below is my network.

Edit:

So, it SHOWS black in the preview windows inside the material editor but when I applied it via Import Tiled Landscape, it seems to work. Weird?