Haven't had a chance to play with it yet but the latest Vizio P firmware supposedly fixed about half of these issues and the next firmware will eliminate them.
So that's the deal, it was the -combo- of X1S and Vizio P causing it. Not just one or the other.
Welcome to 2016, where we've got great tech when it works but it's fing maddening when it doesnt, even for someone who has played with technology for 40+ years. Good luck to the tech noobs.