I can't see Building the Right Thing (Part III): Customers in Recently Active Threads, even if I go back a few days. I can see at least one Meditation, so I certainly don't have Meditations disabled in my settings. What am I doing wrong?

Update: if I go directly to ?node_id=397425;nnt-as-of=2015-11-02, that does show this node. But the latest view ?node_id=397425 doesn't, and the "<" link jumps back to ?node_id=397425;nnt-as-of=2015-11-01 which is too early. Even the "&rt;" link doesn't help from there, that just takes me to ?node_id=397425;nnt-as-of=2015-11-01 again.