The CAPTCHA word verification system for comments isn't working anymore, so I've disabled it. For the moment anyone can comment without jumping any hurdles. However, if I start to get comment spam, I'll have to enable a different option, requiring all commenters to sign in via some social media service like Facebook or Twitter (there are other services on the list).
Hopefully this will work, one way or the other.
Incidentally, I complained to TypePad about the CAPTCHA system, but they replied that they have no intention of changing it or fixing it. Which was helpful.