Well, I uninstalled and reinstalled You Tube TV. When trying to leave a program in process (on the app), my Roku Express continues to play it in the background, audio and all, until I make a choice of a new program to watch or show to play. The ghosting stops then.
This time I was coming off watching The Kitchen live (on the Food channel), and when I chose the back arrow to call up other viewing options in You Tube TV, The Kitchen kept playing in the background, just as MSNBC did before.
Again, this happens only when using the Roku Express unit, not on the LR TV which uses a Roku 3. I suspect this might be a You Tube TV issue. Do you know how I might reach them? Thank you!