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I keep getting this error message?
MathJax no longer loads a default configuration file; you must specify such files explicitly. This page seems to use the older default config/MathJax.js file, and so needs to be updated. This is explained further at http://www.mathjax.org/help/configuration
When I updated to MathJax 1.1, there was an extremely brief (~20s) period where I forgot to specify the config file in the footer javascript that loads MathJax. If your browser cached that bit of javascript, then clearing the cache as Sean suggests should do the trick.
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