New problem with MathJax via CDN?

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I set up an AskBot site to run discussion groups for my math classes this past academic semester: http://mcmcclur.askbot.com/

I had no problem using MathJax with the site all semester long but it seems to have suddenly stopped working and I have no clue why. On the /settings/MARKUP page, I've checked the "Mathjax support" box and pointed to the MathJax CDN repository here: http://cdn.mathjax.org/mathjax/latest/

Again, this is the exact setup that worked for me for months and, as far as I can tell, there's been no change on the MathJax side. I also tried pointing to an earlier version of MathJax like so: http://cdn.mathjax.org/mathjax/2.3-latest/

Is there anything that changed on the AskBot side that might have caused this problem?