This is a small issue, but one which can be a bit annoying. I've noticed that when responding to a thread posting using the "Reply" button, especially if it is the last current post of a thread, that the response appears as a new thread post rather than as a response to the thread post I clicked the "Reply" button in. I've noticed this behavior in the Headlines threads posts, but I also believe it may have occurred in group thread posts. It only seems to occur when replying to the last post, however, if it is related to some sort of caching issue, it might be possible that it occurs to threads that were recently posted but not at the end (such as responding to someone else's "reply" that was just posted).