MathML error message

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When trying to view some pages on this wiki, you might get the error message in your browser

MediaWiki internal error.

Exception caught inside exception handler.

Set $wgShowExceptionDetails = true; at the bottom of LocalSettings.php to show detailed debugging information

This appears to occur on pages that have equations set with <math> </math>, if you are logged in and have math output set to the MathML option.

The workaround for this problem is to go to Special:Preferences and change your "Math" setting to "PNG" from "MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools)" [1]. Despite the comment that it is recommended, it is now deprecated in MediaWiki [2].
  1. http://forum.imagej.net/t/exception-for-logged-in-wiki-users-on-pages-containing-mathml/3364/5
  2. https://www.mediawiki.org/wiki/Extension:Math