Thanks for the responses, guys. This is something I wasn't familiar with before - I'm only slightly disappointed...it just so happens that a couple of the fonts I use are apparently in this category which is no longer supported. The reason I thought it was a bug is because for some reason, Paint.NET has no fonts which begin with the letter "D". This is just a coincidence I'm sure, but it completely confused me because Word 2013 lists many fonts beginning with D, so I thought it might be some sort of weird settings thing.