I really hope this isn't just happening to me, i couldn't find any other threads about it though. So imagine this- it has happened to me many times- you're playing a rather successful game, maybe even on a high difficulty. You just recently ended a war, and have obtained an enemies city. Realizing that might not be the best city for you, you trade it away to a friendly civ, and then- all of a sudden- its asking you to choose a production. You click on it many times to no avail, and figure out the game is unplayable. This has happened to me many times, only through peace trades though. Please help!