OK, all you fans that haven’t been able to comment since the “magic-removal” migration; rejoice. Lee kindly pointed out the error (funnily enough, as I was viewing my web server logs. I might have caught it myself given another 10 minutes or so, but Lee definitely gets the credit here), and I’ve fixed the error. I ran part of the upgrade (for the comments section) for the wrong backend, and missed some objects that needed to be updated in the database.
Back to commenting, minions of Ken! *grin* Thanks, Lee!