MathJax announced it would shut down its custom CDN on April 30, 2017: https://www.mathjax.org/cdn-shutting-down/ . If your Open edX instance is trying to load MathJax from cdn.mathjax.org, you will see failures in the browser for problems that use MathJax.
The exact text of the failures depend on the browser. Possibilities include:
- Unable to load Problem: Cannot read property ... 'Queue' of undefined
- Unable to load Problem: undefined is not an object (evaluating 'MathJax.Hub.Queue')
We updated master and Ficus with a replacement CDN, changing
This change was made in Ficus.3. If you are running Ficus, be sure you are running at least Ficus.3.
If you are not running Ficus, you can make a similar change to your running instance.
The openedx-ops discussion: https://groups.google.com/forum/#!topic/openedx-ops/ORtypVmdWwQ/discussion
The fix we made on master and Ficus: https://github.com/edx/edx-platform/commit/f90b80da6299347868ba3a53598e4e7836d0a27c