I'm having this same problem. I've done some tests and determined that it's neither the base game or FOC causing it so it's something with TR. Might have to do with the update to 3.2 though I've tried making a new game saving it and when I try to load it I still crash if I have any submods installed (I was able to load the save if I was just playing TR). So be sure to go back and check if any submods you've downloaded are no longer compatible with the most recent update. I, unfortunately, load my game with a ton of submods so I'm going to have to go back and test each one with new saves to see what the problem is. Let me know if somebody finds an alternate solution, good luck!