Strange messages after Modifications

[Solver]

I don't know if this is only happening to me, but I know that one more person is getting this problem, and that's why I ask:
When I change one of the gamefiles, either by downloading a mod or creating my own, istead of some game messages, I'm getting nonsense. For example, header of the message saying that two other civs have gone to war with each other, has a title of North America, and so on.
Actually, which are the files responsible for that, and what the possible causes of this are?
I will appreciate any help very much.

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Solver - http://www.aok.20m.com

[OmniGod]

I assume you are loading a saved game... you can't change files and then open a saved game. Some solutions that have helped include openning the cheat menu and reloading slic. If that fails then start a new game and the problems should disappear.

[Solver]

Thanks, I really was loading a saved game. I just thought it might be something wrong with me.

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Solver - http://www.aok.20m.com