That looks like it's associated with the removal of in-post HTML support, which occurred a while back. A lot of threads/guides/etc have HTML and must be fixed manually.
Of course, getting around to manually fixing aging guides when they go unnoticed is another thing entirely. It's been a while since I've last stripped HTML from a post, but it doesn't take that long...:disagree:
Of course, I could be choosing to remember the process as taking a short amount of time, when it really took an hour or two because of the way I chose to do it back then. :eek: