Ok I found what was the problem.
Another screen had been pulled over the 2d grid from the left.
Such a simple solution to such an annoying problem
R3taliate.

So recently I downloaded the cod4 mod tools and today when I started it there was a problem. The 2d grid has a box on it and right clicking does nothing. I think some setting may of changed or something similar. I understand this is an older game but any help would be greatly appreciated. I'll attac...