I've been doing a couple of mods that add extra civilizations, I learned basic things since last year and so far I've learned more things. But I have a problem and it's that a grey cut circle appears in the place of the normal civilization icon in the diplomacy interface to the right of the score and in those lists like "the people with the sharpest sticks" that appear from time to time. Here is a picture. These are the only icons that look bad, the rest are fine.