The only other reason I can think of for it to not work is if you select a font that you don't actually have on your computer. That's why I asked for a URL to a message post by a user that has a default font selected.
Adding color and size are easy enough, but I'd like to make sure it's actually working first before extending it.
Again, the only reasons why it wouldn't work can possibly be are: 1. The field number in the code inserted into the template doesn't match the actual field number for the profile field; 2. You don't have the font installed on your computer, so although it's actually working, you can't see any difference; 3. My instructions aren't clear enough and a mistake was made installing it.
It could be #3... But please give me a URL to a thread on your board where someone has posted and that someone has a default font set, tell me who it is (so I know where to look), and I'll see what's up.