Thanks to mrBen and afongen for pointing out that comments were not working. Right now the entire site is down, after an upgrade to 2.3.
Frustrating… but at the same time, I’ve had almost no problems with Wordpress for over a year, so… oh well. Here’s to troubleshooting.
UPDATE: Comments working again.It was (I think) the ELA plugin that K2 used for the Archive page.
Yup, working.