still can't see "go to first unread post" arrows in my subscriptions list consistently

I have logged on to the new interface. This morning, I visited every thread that I'm subscribed to. Yesterday I saw those rightwards-pointing arrows once to take me to the first unread post. They are all absent now, even though there have been new posts in these threads since my last visit. See the screen clip, below. What am I doing wrong? Is there a setting somewhere I should change???


Edited by pbarach - 6/7/12 at 4:47pm

^^^
So when do the arrows appear (as opposed to the number showing unread posts?