User blog comment:Rappy 4187/Technical Update: September 16, 2014/@comment-4129195-20140916185747/@comment-1038387-20140916191554

It's an old cache issue, it's been around since forever. Sometimes, adding "?action=purge" works, sometimes, you have to wait 24 hours (or until the next general cache renewal. And sometimes, that doesn't work.