Have you visited the site in the last month? If not, it doesn't bother checking for an upgrade until an hour after you actually visit.
I've been visiting, but not posting, but admit I haven't been here for about 6 months. But... I've been messin' around for over an hour trying to figure out the login after it logged me out (kept giving me false errors until I asked for my new password). Even when I first signed up and had replied to 10 posts, I never did get access to the sig file.