User blog comment:Dopp/Technical Update: October 4, 2011/@comment-876022-20111004191219/@comment--20111004192147

Yesterday, due to a performance issue with the RSS extension, we had to turn it off for a period of 24 hours. We turned it on again, but RSS feeds will appear that way for the next 24 hours unless the page cache is broken by adding ?action=purge to the end of the URL.