--when I see someone who has not posted in a while posting again. (Even if said one does not report marked improvement, at least s/he is still in there fighting.)

Generally, when I haven't heard from someone in a while, I send them a private message or some such. But a few times I did this, some of the individuals I wrote to basically indicated they did not want to be bothered, so I stopped doing it. Now I have to be patient in such situations--not my strong suit, I can assure you.

Happy to see you back.