How is this a glitch? Charter refuses to have HBOGo on the Apple TV.
You could, in theory, run HBOGo from your iPhone/iPod/IPad or Mac and AirPlay it to the Apple TV. Not as convenient, but a nice middle finger to Charter. Oh, and I haven't looked lately, but you could see who is CEO over there and give him a piece of your mind. I think the internal email system was first initial last name @chartercommunications.com
I did that once when my grandfather's cable was really messed up, and several hours of phone support and 2 tech visits didn't fix it. He got a nice call back from a VP, and everything was fixed.