Thanks. That does help.

I must be blind. I don't see a difference between that gui.png and the original. Nor in game. I think the yellow I have problems with is one of the middle three on the second to bottom. Is just one of them used in the tech tree or all three used together, do you know?

Not in the classical sense. I'm slightly color deficient in that I can't tell close shades of color apart, though. Someone else has also told me that he has difficulty telling those two apart as well, which I why I brought it up. The yellow is too greenish brown for me to easily tell it apart from t...

Has anyone considered changing the colors on the background of the tech tree icons? The green and yellow are so similar that when looking at prerequisites for for new research, I can't tell what is available and what is done. (I tried searching for this, but I'm not sure if I used search effectively...