If it is of any solace to you, it happened to me too.
http://forums.civfanatics.com/showthread.php?t=495254
This time it was Immortal during G&K, trying a Cultural Victory with Boudicca, and Attila trying the launch.
I had a save to boot and it was verified and (IIRC) posted in bug section as well.
EDT: Just for giggles, pics ThePilgrim graciously put in my thread.
http://forums.civfanatics.com/showthread.php?t=495254
This time it was Immortal during G&K, trying a Cultural Victory with Boudicca, and Attila trying the launch.
I had a save to boot and it was verified and (IIRC) posted in bug section as well.
EDT: Just for giggles, pics ThePilgrim graciously put in my thread.