Welcome back Asthix. It is a nice mod, but for right now play only Custom Games with the No Espionage option. Intentionally or not Hewhoknowsall knew exactly what was wrong. There was a CTD a couple of hundred turns into most games that was hard to isolate. In one case, if both of two cities are eliminated, it doesn't occur, but if only either of the two is it does. In another case, if a particular cities population or food supply changes on one particular turn, it does not occur. I had eliminated Python or DLL as the issue. I woke up one morning thinking about this, and realized it is something global, no point in trying to pin down what unit or building it is because it doesn't pinpoint like that. So what's global that way, that a QUANTITY would affect? I was also thinking about the differences between BTS and Vanilla, which includes espionage and that led me to the answer: a lot of spy missions are non localized and "quantity" oriented, such as the one that takes a percentage of gold of an entire civ. I just ran a Near Future start game on EarthTitan for 400 turns under the no espionage option and no crash. Crashes were occuring pretty consistently at between 200 and 300 turns, so from this one sample I can say the problem is in espionage and recommend playing without it until I can pinpoint further and correct.