Civilization 5 grey map, please help!

okay so I have civilization 5 on my macbook pro, and i know that everyone will say that it's because of that, but it used to work! I really need help here's a picture of it. everything works right up until you start the game, it works with all the menu's, but then the rest is grey, i'm begging you guys, I REALLY need help, i'm at a loss.

Moderator Action: Moved to tech support.

Please give us some infos about the hardware in your computer, then we'll look further (because i just have the suspicion that your graphics card might just be to weak).

And welcome to CFC .

Your issue is somewhat similar to something I've got when I Alt-tab, seems to be related to the game failing to refresh the graphics.
Are your Video drivers up to date?

my processor is 2.4 GHz Intel Core 2 Duo, Memory is 4 GB 1067 MHz DDR3, and I have NVIDIA GeForce 320M. And I don't know if my video drivers are up to date :S how do you know?

Oh and thanks The_J ! this site's pretty sweet

braytholomew said:

my processor is 2.4 GHz Intel Core 2 Duo, Memory is 4 GB 1067 MHz DDR3, and I have NVIDIA GeForce 320M.

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The 320M is a weak card, it's probably having problems with filling the screen with the right textures (so Sjru is right). If you haven't turned down all the settings, then this is what i would suggest: Minimal settings.

braytholomew said:

And I don't know if my video drivers are up to date :S how do you know?

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With that question, i'm just guessing that they are not (because the drivers are updated every month, or so [that's a rather guessed random time frame, but could fit]).
Just install the newest one, it will cause no harm. You can find all the graphics card drivers here, just choose the right one for your model.

braytholomew said:

Oh and thanks The_J ! this site's pretty sweet

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Nice to hear, thanks .

Well none of that worked , so tommorow i'm gonna buy the windows version, and play it with bootcamped windows 7!