You probably hit "Set my Newest Nodes Flag" a long time ago, and then forgot to take it off. Go to User Settings and then click the button at the bottom of the page that says "Clear my Newest Nodes Flag." That should fix you right up :)
Since this method was apparently tried but didn't work, I hand rolled a link that should set your newest nodes flag to just a few minutes prior to when I'm posting this.
Warning this link will muck with your newest nodes flag, so don't click it unless the User Settings one isn't working for you.