I wonder whether threads get stuck sometimes? I posted something from within the Content Forum fifteen minutes ago or so. In fact, I added a comment to an existing thread “Letters from my cottage in England”. So far it hasn’t appeared in the Recently Active Threads list.
(I bet, the minute I post this, the other thread will appear…)
@ Alex: I took out a couple of URLs in the original collection description box in the library and then wrote a comment in the offending thread which appeared immediately. Might those Urls have been the culprit(s)?