Round-and-round twirly thing
[Edit: @rob solved this; thanks.]
The forum code seems to have gotten into the habit of showing an indication that it is working on something, and this persists indefinitely in some contexts. I just started to notice this in the past few days. I did not explicitly accept any update to the code recently, so I don't know how to account for the change in behavior. Maybe it is doing some kind of automatic update.