When I try to change terrain for making a scenario, it's ok, however, when I try to alter the irrigation icon, it malfunctions and blends in with the replacement, I've tried manually replacing the icon on terrain.bmp in the folder, however that makes it worse, when that happens it inverts all the colours and I have to remove the entire file and revert to the original. In addition, when I try to change irrigation back to the original on the FW editor, it doesn't work and reverts back to the blended icons. So what's going on?
Here is an example.
Here is an example.