Hello, I've attached a screenshot and a save file with an example of the unique improvement graphics glitch. I've seen it discussed here a few months ago. I vaguely recall there also being a discussion that this might be a Mac problem. I also recall that most of the improvement tiles were Leugi's design, so I hope that if this is useful it will get to whoever can use it. Notwithstand this one glitch, the new civs are all fantastic and I'm really enjoying them with the decisions mod. Kudos all around!