I know that many people are having problems with the font ingame.
I had been thinking and I have found a solution for it, at least it worked for me!

Just press rightmouse button on your desktop, choose 'Properties'.
Then choose 'Settings' and click on 'Advanced'.

With an ATi card (which I have) choose for 3D.
There should be a mark, called 'Customized settings'.
Mark this option off and it should be fixed!

I think it has something to do with anti-aliasing or something like that, but I am not 100% sure off this.
Hopefully this helps a lot of users, or you now may know where to look to solve this problem!