My curiosity got the better of me... I just tried it again.
I can be a bit more helpful - I get the intial login and can log in, however a few moments later the computer grinds to a halt - I can hardly get windows task manager to run. My pc is old, but I run lots of 3D graphics software and I never have a problem... the you tube living room app is definitely sucking the life out of it....
I don't like to be negative about such a great looking service, but I guess you need to know.
