Long story. It looked like the MathJax svn mirror hadn't been updated in about a month. I prefer to simply check out the latest stable copy rather than try to keep track of what copies of everything I have. So I decided to clone the MathJax git repository to update the fonts. This was correct, but I forgot about one crucial bit that we need to make MathJax function properly on MO. Since MathJax is hosted on a different server from MO itself, Firefox's same origin policy prevents the webfonts from loading. This can be fixed with an .htaccess file, and now it should be.
Please let me know if you're still experiencing any problems.
]]>all will be well.
]]>It seems like math.SE is also running with the new fonts. Can you confirm that you have the same problem there?
]]>Does clearing your cache help? Is this widespread enough that I should revert to the old fonts, or should we be trying to push through and solve this some other way?
]]>