I just stopped using the monitor after half an hour of using OS X on it and gave it to my roommate, since I'm hardly ever home anyway. Now it's back on my desk again.

It bugs me that I thought I needed a better screen instead of instantly seeing what's the issue. Especially since I used to play around a lot with the Freetype settings in Ubuntu and should have known what makes the fonts look the way they do.

But then again I trusted Apple to not let this kind of stuff happen.