I've been using Mavericks since day one and one issue is really bugging me: Alerts don't work. When I set the app to Alerts instead of Banners in Notification Center, it doesn't send any alerts when my Mac is asleep. In the past day, it's gotten worse: no notifications at all. They don't show up in NC or on the desktop. I see a small banner but nothing aside from that. Has anyone else been seeing this?