No, the 500 is not the number of errors, but the error code that many users saw when trying to look at lists of calculators by manufacturer, or at individual calculator pages. It appears that as a result of some changes to the innards of Joomla! or one of its components after the latest update, the scripts that generated these listings and individual pages were called more than once, resulting in fatal errors when functions were about to be redefined. Thankfully, Google is kind to us Webmasters: This morning, I received a warning e-mail from Google that many of the pages on this site were inaccessible, and thus, the problem was present only for a few days.