We are still investigating the issue and further research will be required to determine if a workaround is possible. At this time, it is clear that the new Apple TV software demands Apple’s proprietary FairPlay encryption in order to be allowed to send audio to it. This limitation was not present in older versions of the Apple TV software. Figuring a way around this encryption, or if it’s possible at all, may take some time.
Unlike previous updates that added new channels, version 6 of the Apple TV firmware goes under the hood, adding support for Apple’s iTunes Radio streaming service, allowing purchases from the iTunes music store, supporting podcast syncing, and providing access to shared iCloud Photo Streams. Additionally you can stream purchased iTunes content via iCloud to any Apple TV, even when it isn’t currently using your iTunes credentials.
Update (2013-09-26): Paul Kafasis:
Today, we’re happy to say that issue has been resolved in Airfoil for Mac. Airfoil 4.8.1, just released, works fine with the new Apple TV update (and all other AirPlay-compatible devices).
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