@jgf: When was the last time you got a notification before you noticed that they were turned off?
@rorie: I can't remember. Could be as long as 2 months. The last message I got is from June 14, but I can't see any previous notifications in the notification history. Perhaps I tried to switch from notification messages to notifications, I really can't remember. But it works now, so I'm happy.
@shockd: Everything should be working correctly now. If you can link me to a comment where you should've gotten a notification but didn't, though, that'd be handy. Keep in mind that sometimes people will manually type out @ShockD and stuff like that that doesn't actually cause a notification to be sent.