It just came to my attention this morning that Jetpack for WordPress has not been playing nicely with the comment forms here on RCN. For those, like myself, who are logged in to the blog most of the time, no error was visible. But for those who are not commonly logged in, no comment form was visible!
To fix the error without weakening the security measures I implemented to prevent RCN from being hacked (again), I have had to delete the Jetpack plugin. I had thought it would be a boon to RCN for visitors to be able to post via their WordPress, Twitter, or Facebook account, but it turns out that the party was over before it even got a chance to start.