If you've tried to leave a comment and gotten the message "not a hash reference," it's not your problem. Something seems to be wrong at TypePad.

UPDATE, 10pm Central (USA) time: TypePad says on their Twitter feed (I'm not on Twitter but they publish it on their main page): "We are noticing that there’s an issue when commenting while not signed in. We’re on the issue & appreciate your patience while we work on it." 

There is a sign-in facility for commenters but I've never enabled it here, so all comments here are "while not signed in."

UPDATE, 6:50am CST: Fixed, apparently, as I see some new comments.