Since updating to OS X 10.9.5 air display has been greyed out in display options and is no longer available. Worked perfectly prior to update
MacBook Air, OS X Mavericks (10.9.5)
Posted on Oct 4, 2014 1:30 AM
Q: Since updating to OS X 10.9.5 my air display has been greyed out in display settings and is no longer recognised
Since posting this question i have solved the problem...
Open network preferences/advanced/TC/IP tab
Set Configure IPv6 to Automatically and apply network then sees Apple TV in display settings.and icon appears.