Vray Next - Generic Material - Bump Map not showing upon importing

Hi there!

I am currently working on a rendering in Rhino 6 with Vray Next.

I have linked multiple models as Blocks into one where I am doing the rendeing in. Each linked Model has Vray Materials applied to the geometry. These all show up in the Model where I linked them, with a small exception: the Generic Materials that I defined myself (so not chosen from the (vray Material Library) don’t show the colors or textures I applied to them.
As you can see below, the Bricks Material has no problem showing up…

I tried updating the Linked Block Models multiple times, Relinked them, Restarted the PC… nothing seems to work.

Any help is appreciated!