Hey, After latest update of Mavericks (10.9.2) my Airplay has stopped working. Tried connecting, and mirroring to both a second and third gen Apple TV, both updated to the latest settings. Tried restarting computer, Apple TVs, toggling Airplay on and off, etc. The "extend desktop" setting is stuck on, and mirror desktop won't turn on. Sound works, just a black screen on the Apple TV though. Any idea?