Problems with RPM Fusion Hyperkitty not displaying replies?

Is there a (known) issue with the HyperKitty instance at htttps:// lists.rpmfusion.org/, did something break recently, or am I just Doing It Wrong? If I view, say, this recent post by Richard: https://lists.rpmfusion.org/archives/list/rpmfusion-developers@lists.rpmf... I can see that it has "3 comments" (replies) from "2 participants" (Rathann and Sérgio), but I can't *see* those replies! The "Show replies by thread" link does nothing, and the lower-right progress box shows "Unreads: 0/0". I know the replies really exist, because they showed up in my GMail account. (Actually, there were more replies than that, but I'm guessing the rest were nested replies-to-replies.) But not being able to see the whole thread is kind of a pain. I was hoping to link to the discussion there in reply to Luya's most recent email, since the question is answered there — or would be, if the answer were actually *visible*.