This seems to be tied to a compressed saved game which is not opened correctly. If you don't mind restarting your current game, then the easiest solution is to delete your saved games manually
they are in C:\Users\<your user name>\Documents\My Games\AGE\CW2\Saves
then launch the game, go to main menu, options, system tab and uncheck 'compressed saved game'
Sorry for the trouble. The first patch will turn off compression by default.
Hofstadter's Law: "It always takes longer than you expect, even when you take into account Hofstadter's law."