It seems I can no longer comment on questions. (Using Firefox 4 Beta 8.)
Yesterday, I could type a comment, then submitting would simply discard it. Today, "Add Comment" doesn't even work.
Anyone else experiencing this?
@Jarrod: Thanks. Seems the problem with displaying the comment box is only sporadic, but the submitting problem is persistent. In fact, it seems AJAX is generally quite broken. Just realised post preview isn't working now too.