Edit: After half day, my wife’s Mac started having the same problem. I have then applied the solution that I found in the Apple
New Apple TV Update Allows You To Stream Vimeo And TV Shows
There has been reports from @gruber backed up by iOS Firmware that Apple TVs will be getting and system update some time today with some enhanced new firmware. Earlier reports indicated that you maybe able to now stream any items purchased to Apple TV and also the update may show apple supporting Vimeo
Some more issue the update should fix –
– Addresses the issue of which audio is not output when playing some video content.
– Resolve a issue in which video is not displayed when playing some content.
– Improvements to the performance of fast-forwarding and rewinding live events.
– Addresses an issue in which the description information is not displayed for some movie.
We have FULL Coverage of the iPhone 5 Live Event and other Apple events Here and on Youtube