Hello!

I dont know exactly for Mac OSX but in Classical Mac OS 9.X there was a bug like this that was caused by inproper System Fonts selected in the Appearence control panel. Go to your Appearence Control Panel and for the general System Fonts select Geneva 10 points and then re-start your computer and see if it helps any.

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<img src="http://www.jordysworld.de/emoticons/blob16.gif">Sincerely Joakim Agren!