Downtime Warning - A Tale of Maintenance Past

I looked and I didn't see it so sorry if this was reported before, but I think I used to be able to click on the little squares that sit to the left of each subforum to mark that subforum as read, and now they just appear to be images that are shaded if there are new posts and blank if there aren't (so like before, except I can't click them to mark a subforum as read).

I'm already starting to wonder if I'm conjuring false memories about this because nobody else seems to have reported it, it is a fairly common message board feature so it's possible I was confusing this board with some other one, but hey... it'd be convenient?