Maps I created for original CIV V in WorldBuilder fail in Gods&Kings

I have a bunch of maps I created in World Builder and have used many times successfully with the original CIV V. They seem to load up fine with the Gods&Kings expansion running, and play OK until I get the message that I have received enough Faith to choose a Pantheon. However, when I click on the bar at the top of the box in the lower right corner, the bar depresses, I hear a click noise, but no further action occurs. I cannot play beyond this point. Anyone with similar experiences, or know-how to fix this. I really hate the game-generated maps, and the CIV V WorldBuilder takes HOURS to create really nice maps! Much thanks in advance for any help.