If someone sends you a PM, then deletes it before you read it, it disappears from your inbox but you still get the notification. And ... that's what I did to you last night, Boss. Sorry! I had PM'd you to see if you'd spot-start the game thread, but when I checked back later, you were no longer online and hadn't read the PM yet. So I deleted your message because I asked someone else to spot-start. Can't speak to the other false alarms you received, though. eta: maybe you have a shy secret admirer who keeps PMing you, but then gets nervous and deletes it!!