Powerpoint 2008 Greek Fonts
I had a problem with one of my clients powerpoint installation today. They had recently updated to Office 2008 and since then, powerpoint wouldn't display fonts correctly. In particular, arial (regular) wouldn't display correctly, no matter what size, but as soon as I changed it to the bold or italics version, it worked.
The fix was pretty surprising. It turns out that Powerpoint is somehow dependent on the 'symbol' font being present. The solution is so bizarre that I did a number of test to ensure this was the fix. Seems like <cough>bad programming<cough>.
So, if you're having problems with powerpoint 2008 and fonts. Make sure Symbol.dfont is enabled on your system.