¿Missing Base Texture?

[Fingolfin]

As you can see in the following picture, whenever i make a bridge or a tunnel one of the ends has always a 1x1 section with black base texture. I tried with different maps, different bridges... but the problem is always the same.

I have installed the last version of the NAM.



Any idea?

Thanks in advance.

[Biriali]

This happens for me sometimes, too. I have always been able to fix it by clicking with rail road tool on the affected tile.