Hmm, don't you think the problems would have arised in earlier stage of the game? I will try to upgrade my Nvidia drivers over the weekend and see if it helps. However one thing to note is that the bugs may only appear to be related to the diplomacy screen, while they could be actually related to the AI unit movement following the diplomacy screen. Have you seen my bug report #2611? Once I deleted the Shoshone AI units, my CTD by the end of Shoshone diplomacy screen went away.
NeyNey, ForAPrice, AlvinRow and others getting CTDs: Would you please install IGE and try killing all units of the AI civ which seems to cause the crash (you have to switch civ and then there is a button to kill all units of the selected civ)? If it prevents the crash, then I think it will indicate the CTDs are related to the AI unit movement rather than diplomacy/graphic card drivers.
Anyway, can anyone tell me how to activate the Operational AI logging? I cannot find it anywhere.
I didn't know there was a button to delete them all in one go. I was doing them the hard way! Haha
But yes, when I delete the civ in questions units, I can proceed to the next turn.