Terrain Bump Textures

[Delinquent]

Anyone else having the problem that the global directional light does not make the terrain Bump textures visible? It only seems to have an effect on the detail texture; at least if you reduce the lighting quality in your graphics options the terrain detail texture will disappear.
It also does affect the objects´ bump textures but not the terrain.

Omni Directional lights, like blaster glows, explosions and those attached to objects do make the bump texture visible.

Now, my question is, is there a way to make the global directional light show the terrain bump textures?