I'm just guessing here, but I've had a problem with the FSX ATC font getting corrupted that was caused by not having the mip-map quality in the Catalyst Control Center set to Quality or High Quality. So if you have an ATI card, make sure your mip-map setting is set to Q or HQ, not performance. If you don't have an ATI card, then my guess was wrong.
Hope it helps.
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