Up until last night every game of Civ V has run perfectly fine. However, once I started a new game yesterday I noticed something was wrong. Every game I started had the marsh tiles replaced by an all black tile (red and white checkerboard when using DirectX 9). I also noticed that no luxury resources appeared in my games. I have tried changing all the in-game settings to no avail, tried reinstalling the game, and when I would try and verify integrity of game cache it would say "2 files failed to validate and will be reacquired." None of this has worked however. If anyone has any ideas as to what I should do please let me know.