This issue is all over the web but read Kelle's reply at https://developer.yahoo.com/forum/General-Yahoo-TV-Widgets/Vizio-Smart-Tv-netflix-not-working/1403365767763-27b3ad13-8ae4-46e5-81bb-c27ecc082fa5/
Everyone seems to think this stuff should be flawless. I agree.
Is it normal that I have to enter login details every time I want to open up netflix? The youtube app was doing something similar a while back but it started behaving itself, has this always been the case with netflix?