In the next few days we’ll be changing the format of the blog and moving it to a new server. If you have difficulty posting comments, just wait and post them in a few days when all should be working well. (But if you can post a comment, go for it. All the old entries and comments should be reappearing in the reconstituted blog.)
I guess that means that we can't post comments on threads from the past. I tried to update an old thread, but I got a server error.
Yup. This'll be fixed in a few days when we move the blog.