Trying out Mathematica 10 and I still get the Courier font, not the new font shown in all of the examples on Wolfram's website. Anybody have any ideas how to get the new font working? Running on Mac OS X if that helps. I also deleted my entire Library/Mathematica folder, but that did not help.
Mathematica still works with Courier by default. Nothing is broken about your copy of Mathematica. It is the case, however, that if you use any sans serif font (or at least any font that properly advertises itself as sans serif...many amateur font designers don't bother setting font metadata bits correctly), you'll see the new MathematicaSans font in use for the Mathematica characters. It was a lot of work and long overdue, and we're very proud of it.
So why are the examples different? The short answer is we're doing different things on the web and on the desktop. For now.
The long answer is that there's been a bit of a row within the company of which, I confess, I'm one of the chief instigators...but I won't say for which side. I think that most people would like to see us retire the tired old Courier for something a bit more modern, but the big question is whether that font should be proportionally or mono-spaced.
On the one hand, Mathematica has never offered a strictly monospaced environment. That would be impossible with true typesetting, but even without it we do things like putting little spacing hints around operators and such.
On the other hand, Mathematica is a full coding environment for the Wolfram Language, and it's pretty uncommon for a coding environment to use anything but a monospaced font. It can really play havoc with attempting to do proper indenting, and arguments can be made that code is just not as readable in proportional fonts, especially in regards to the treatment of punctuation and delimiters.
So we've split the difference between the web and desktop environments for now, which is probably not a permanent solution.
I'm curious what SEers think about the situation. Maybe those who care might look at the comments below and upvote what most closely represents your opinion
Nothing is wrong with your settings. Mathematica 10 is supposed to be using the old fonts. The old fonts are shown in the blog post introducing Mathematica 10.
Note: People report that the hack described below doesn't work on Windows or Linux. It works on OS X, where I tried it.
But you can play with the new fonts if you like. Go to
convert the cell back (Command-Shift-E), then close the style definitions window. Now the notebook will use Mathematica Sans for standard form expressions.
Here's a better example showing actual code:
You can also try