On a possibly totally unrelated note, though the effects are somewhat similar -- I have subscribed to the Calibre ==> Editor subforum, and at random intervals it will unsubscribe (as far as I can tell, I have not done anything to change anything) and I have to resubscribe. This has happened to me three times so far (going back into the depths of my memory).
Any idea why this might happen?
Not a tremendously big deal, since at least I can remember it to restore... just weird.