Why can't replies to answers be seen?

When I reply to an answer to a question I’ve asked, I can’t see my reply, though it appears to have successfully posted somehow, because of a prompt that happens afterwards. Reloading the page doesn’t seem to load my response to the answer either.

There was a bug with the Questions and Answers system; I just fixed it. Comments on answers now show up. (We’ll work on improving the styling soon.)