I came across this thread:
http://forums.civfanatics.com/showthread.php?t=388208 which seems to be describing the same problem of grayed out tiles and flat single colour terrain, but that fix hasn't worked for me.
Have you tried updating the graphics drivers (if they're available)?
I had a similar problem when I attempted to use the Intel HD 3000 drivers with the game on an HP computer. Using the HP driver, although much older, made it work.
I
had forgotten to update the driver on this one, thank you. Unfortunately this didn't fix my problem.
timtofly said:
Not really above it by much. From your posted picture there is still too much detail loading. Above specs means that you can play it in strategic view, not graphic view.
It seems unlikely to be a hardware problem, as even this weaker machine can run more demanding games than Civ, such as Skyrim on medium-low settings, and Shogun 2 FOTS on 70%.
I've also tried Civ on several graphical settings ranging from the absolute minimum, to the highest, and the problem is consistently the same. It renders things like water, FOW, all units, and the interface with no problem, but the terrain tiles are smoothed out and undetailed at every graphical setting.
There isn't any framerate drop during Leader interaction on high, even.