User blog comment:Dopp/Technical Update: March 27, 2012/@comment-3030984-20120328151344/@comment--20120328162813

So the initial issue was that __NEWSECTIONLINK__ wasn't being able to be added on the Forum namespace, even if the magic word was inserted directly in the text.

A side effect of the change seems to be that it is now the default action on the dropdown on Forum. I don't think it should be that way, so we'll re-assess and hopefully fix.