@PMattABQ, that's interesting. I apologize; I stand corrected. It isn't clear from your posts - are you saying that if you leave your Roku idle for a period of time your TV acts as if nothing is connected (as the OP stated) or are you saying that the screensaver doesn't appear when you expect it to (i.e., you get a blank screen instead of the screensaver)?
I guess I'm SOL then. Just have to let it time out at home screen to get it.
The Fish Tank screensaver used to come up when I first made the selection for Roku. Now it goes directly to Home screen. It is only a minor inconvenience to wait 5 minutes for the Home screen to go to screensaver, but it something a customer notices as changed/absent.