I've got a game I was playing on the 6.1 release candidate (not sure of the exact version number) where I played through and was one turn from a tech victory. Attempting to run that last turn through the game results in a crash to desktop after the AI has processed its moves. I have the save available here: http://www.iguanadons.net/Altarians.7z
I can reproduce this crash on my game every time. Simply load it up and end the turn.