*see title* For example, just now in my game the computer asked me to pick between the Clausewitz and Jominian army doctrine. When I moused over each choice to see what the results would be, it was just a blank space. This doesn't happen with most events/inventions, but it does happen consistently with a few, e.g. the army doctrine one and a lot of the political cultural inventions. Is this a common problem or does this just happen to me? Anything I can do about it?