I can't say for sure that the new icon has disappeared for me too, because I've just read all the latest posts so I wouldn't expect to see it. But I'll assume it's disappeared for everybody.
It probably results from a recent change I made in the way the Forum Latest panel is generated. The process of getting the information is more indirect than it used to be, to try to avoid "insecure connection" messages in some browsers, as discussed in another thread. I'll see if I can get it back.