I've been playing Civ 5 for a week or so now, having grown up playing the entire Civ series.
The one thing that is driving me absolutely nuts: I can't figure out how to get shading over the revealed-but-outside-of-my-view tiles. I'm used to these having a dark tint to them, or something that indicates that I have explored, but, can't see it.
I've seen various screenshots that show a lovely dark tint to these tiles. Any idea what setting I need to change to make it easier to determine what I can and can't see?
On the image below: That's my city border in the upper right corner. There's no distinguishable difference between the tiles just outside it and the rest of the tiles.
Edit: A great example of the shading I would like to get can be found in the image below (taken from an answer to another question. I would like the shading that's over Damascus/Bagdad/etc.. In my game, all of the tiles are shaded as if they were visible even though they are not.