>There are a few variations of Arial, including stuff like Arial.ttf, Arial Black, Arial bold, etc... if you can get those back into your /Library/Fonts folder that should hopefully fix up that problem.

Thanks a lot. The Arial family was the first font I tried yesterday but I made the mistake to install all fonts into my Username/Library/Fonts folder. I just moved all Arials to /Library/Fonts, restarted MoI and enjoyed the result.