Apple TV won't launch third-party apps
Any non-Apple app that I try to launch on my Apple TV just gives me a blank, gray screen. I've tried HBOGo, Netflix, YouTube, etc. The Apple apps seem to open just fine (iTunes Movies, iTunes TV, App Store).
I've tried closing the apps and restarting Apple TV -- no luck. Only advice I can find is to delete and re-download the apps or contact the service providers of the apps, but why would NONE of the third-party apps work?
Thanks for any help!