Well I played through 50 turns with that save, but it was just too much for this old computer, and crashed when I tried to build a city. I really don't think it's related to any problem other then overloading my computer though, I tried to replicate the same thing on a smaller map, and had no problem, and my computer was chuggin hard trying to deal with that Huge map in the save. I'm wondering, are you using Vista? It's possible that if you're using vista there was some null value that caused a crash, I can't test that though until I get a debug dll compiled, which I need to get the makefile from glider to use. Anyway there was nothing that stood out that could help me figure out the cause of your crash, at least not yet, will look more into this once I get a debug dll working. Thanks for uploading the save though. I wish I had a better system to properly check it.