I have a similar problem, except that it ongoing and only affects my city header graphics. The maps/terrain all display fine, but my city header bars have NEVER displayed correctly, from the moment I started playing. They all show a series of blocks and bars where any font or icon should be, meaning that from the main screen I can't see
-my citys name
-city size
-religion or production icons (ie taoism practiced here, or high science output etc)
-current unit production, or progress