Re: Does Ultra model 4660x support Roku mobile app?
Reply to self: user error, discovered you can only display three Roku devices at a time with the short cut icon in the Roku mobile app, and my Ultra would have been the fourth. Solution: By selecting the control menu Icon and choosing the menu item switch device, it will give you all know Roku devices for your account, on or off the network. I happened to have four on and two off-network. I am sure this wouldn't be an issue for most.
I hope this solution will be an easy answer for others and avoid troubleshooting.