As soon as they get to the point where you ask them to do something unique to the civ, they all seem to crash for me, and it's repeatable. For instance, on the Canadian civ, anytime I try to build the Avro Arrow, it caused a fault and crash back to desktop. That was easy enough to work around as it's not that useful a unit without air superiority but I also created a civ through the copy tool and it crashed as soon as I opened my foreign advisor page (although the Cdn one didn't, now that I think about it). In the first situation, there were no other mods to the rules, with the second, many tweaks. Is there something I'm not doing right or forgetting with the editor?