Well, I ran into the commenting bug that a few people have reported over the last few weeks. It turns out that there were two of them:

• If you changed the title of a comment, the comment failed. That was due to my sending a spam check to a class instead of the sole instance of the class. Doh
• Depending on how you entered a comment, the first character of a new paragraph would get chopped off. That was just a dumb mistake in the code.

I'm pretty sure I got both of those dealt with, but if not - I'm sure someone will let me know :)