I get the following error message when trying to find a connected iOS device in the AIR for iOS Settings (Post publishing option):
"iTunes MobileDevice library not found. Please check your iTunes installation."
iTunes works fine, and I am able to see connected devices in that application. I am running Windows 8.1 64-bit, Flash Pro CC 220.127.116.116 and the latest iTunes.
I've had this problem for since September 2013, but have not been able to get any useful information out of Adobe. They blame it on iTunes.
See this thread for more:
It did use to work on my system. I have another colleague with exactly the same versions installed and it works for him.