A number of Mac users in an Apple Support Communities thread are reporting that Apple’s 10.9.2 update to Mavericks has broken AirPlay Mirroring to Apple TV and the ability to extend desktops to external monitors.
There is as yet no obvious common denominator among those experiencing the problem, though as it works with fresh installs of OS X 10.9.2, it seems it may be a conflict with a setting from earlier versions of OS X.
Mail issues have also been reported with 10.9.2. Although the Mail problems that have been plaguing Mavericks were supposed to have been resolved by this update, some users have been reporting spinning beachballs when used with Gmail accounts, though with a possible solution identified: unchecking Gmail accounts in System Preferences, opening Mail then deleting and recreating the accounts. This is only safe if using IMAP, otherwise mail will be lost.
