Every now and then, I’ll get a Dock item with a notification badge that just won’t go away. It has happened with App Store, Calendar, Messages: an annoying red disk alerting me that some number of updates, invitations or conversations require my attention… except they don’t. The badge is stuck, an annoying vestige of some aborted operation, and no amount of relaunching, refreshing or restarting seems to cure the problem. What does appear to work is killing the Dock process. To do this, simply launch Activity Monitor, find the item named “Dock,” and click Quit Process. The Dock will disappear, relaunching a few moments later. And behold! No more phantom badge.