The CTD on turn update raises its head again in my current game. The attached save game _always_ crashes, without error msg or minidump. Following your advice, I changed the thread count in the New Dawn-global defines xml to 1. This helped in the previous game, but the current game seems doomed. I also tried changing it back, it makes no difference. I am on the latest SVN. Game has a giant map, epic speed, no revolutions, and no barbarian civs.
Update: tried everything, from going back to earlier savegames to changing building orders, can't get beyond the turn where it crashes.
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I also had another bug/strange issue with this game; there was a turn update that didn't end; I thought at first it was just an epic AI battle somewhere, but after 90 minutes, the update still didn't end. However, different from the last time this happened (fixed), the program didn't freeze, the clock didn't stop, the process was listed as "running" and the mouse pointer remained responsive ingame, so that I could open the game menu. Only the update would not stop. I then terminated the game and reloaded from autosave (I have set to save every turn), after which everything was fine. Problem resolved, yet very weird.