OK, I set up a dozen games and one civ would crash the game every time: the Ferengi. The game would run with the following races, in various combinations, but not the Ferengi:
Tellar, Vulcan, Andorians, Dominion, Klingon, Romulans, Tholians, Borg, Cardassians, and Breen.
Hope this helps to narrow down my problem.