I am just a customer not an authority. I can feel your frustration though I have been there. While Comcast does not seem to want to admit it. I certainly seems like they have very little support for Roku. I too have a Roku 3 box in fact more ten one in my home. I stream most of my media over a local area network in my home. I have my televisions connected to my network with Roku 3 boxes or Xbox 360s or a PS3. I run a computer all the time on the network that has windows 7/ Windows Media center/ Open Server WMC/ PlayOn/Play Later installed on it. Granted this is a pretty elaborate setup I have to do what I do but it has become somewhat of an addiction for me to build on it. However I have found that when I go to my Roku 3 I can start the PlayOn app and then go to HBOgo which is installed within thePlayOn app and I can then watch the HBOgo on my tv as the PlayOn server authenticates on my computer and just streams it to the Roku. I hope this was not to complicated of a reply but it is what I have found to work to get HBOgo on my living room tv to be able to watch shows that are not playing live on HBO.
... View more