I cannot determine whether I can fix my problem with a change in video or other settings. I have a save game that crashes whenever I click the End Turn button...anyone want to try it on their system? I have just recently concluded peace with an enemy after some warmongering. DX9 vs DX11 makes no difference, and I toyed around with a number of video options as well. If the problem's with the game engine, I'll just have to write off this session. I'm using an Intel Core 2 Duo E8400 with a 512MB Nvidia 9800GT on Win 7 x64 Professional with 8 GB RAM. No overclocking involved.