Apple Caching Server seems to stop third party content from downloading.
I had three AppleTV apps not able to work until I turned off my local IOS caching server.
That's a pain for those invested in the ecosystem because the caching server is *the* way to speed up multiple updates across many devices.
For now, it's staying off, but if anyone finds a workaround to just exclude the atv from caching, I'm all ears. I had to:
Uninstall apps with failed third party content.
Turn off OS X server app caching.
Restart ATV
Reinstall apps.
FYI.
OS X Yosemite (10.10.3)