Okay, now we're getting somewhere. Shut down the game, and open up your config.ini (mine is located here):
C:\Users\dennis\Documents\my games\Sid Meier's Civilization 5\
Find and change the following variable:
LooseFilesOverridePAK = 1
Let me know how it goes. Based on what we're seeing above, you guys might have a pak file that has an older version of the file floating around.
not getting errors when entering hot seat now that i did this altough i dunno if it was like this before with the previous fix