You were using this method -- buy from iTunes, stream (not download), then mirror to ATV -- since there was no option (previously) to just AirPlay directly, right?When I tried to, use my tried and true method to Airplay my rental from phone to ATV, however, I received a surprise message on the iPhone informing me "an unapproved monitor was attached" and then the film stopped. Trying other methods would start the film but after 5 seconds, no message appeared, but the screen went black and only the sound continued.
See if you can just (without mirroring) AirPlay the video directly from the Videos app on your phone to the AppleTV now. AirPlay from iCloud (that is AirPlay from an iPhone which is streaming from iCloud) is now possible on ATV 6.0.
To me it sounds like you might be running into an HDCP problem (HDMI Digital Copy Protection, I think).
Secondarily, you could see if playing directly from (not using your iPhone, at all) the Apple TV itself gives the same error message. That is sign into your iTunes account on the AppleTV itself and then access the purchase from the Apple TV itself.
HDCP is something that Apple has to respect to make Movie / TV show publishers happy about putting their content on iTunes. Even though you aren't trying to pirate or steal -- the new Apple TV software might be looking at the HDMI to VGA converter as a suspect or unauthorized device.
So we might be able to work around it by playing or presenting the content to the Apple TV in a different way.
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