You have been directed to this site because the page you were viewing uses MathJax without providing an explicit configuration. In version 1.0 of MathJax, this would cause a default configuration file (config/MathJax.js) to be loaded to configure MathJax.
As of version 1.1, you must configure MathJax either by loading a configuration file explicitly or by including in-line configuration that sets the jax array. MathJax no longer loads a default configuration file. If your page used to use
<script type="text/javascript" src="/MathJax/MathJax.js"></script>
then you will need to add an explicit reference to load you configuration file. For example,
<script type="text/javascript" src="/MathJax/MathJax.js?config=default"></script>
will load the file config/default.js to perform the configuration. Because the name config/MathJax.js caused some confusion, it has been renamed config/default.js instead, so you should edit the config/default.js file to correspond to the configuration you want (e.g., that configuration that you had in config/MathJax.js).
More information is available in the Loading and Configuring MathJax documentation, and the Migrating from v1.0 to v1.1 documentation.
