My web server is currently having problems. It’s coughing up 500 server errors on my various comment scripts, and doing so ever-more-frequently. I’ve just submitted a support ticket, so I expect that the problem will be resolved soon.
In the meantime, if you get a 500 server error, the only thing to do is reload the page. However, if you’ve just submitted a comment, reloading will probably result in a double submission of the comment. (I’ll delete any of those that show up.)
Thanks for your patience!