Something broke. I think there was no problem when I last visited a couple days ago. Today all posts have only a down arrow for the spillover actions, no icons. If I move the mouse above where the icons /should/ be, the pointer turns into a finger. So the actions are still available but just invisible.

(edit) when I use Firefox and enable displaying images, only then can I see icons. I normally use Ungoogled Chromium with images disabled (images dramatically increase my Internet costs). So I wonder if someone tried to get fancy and install images instead of icons from fonts.