Thanks for the tip about Adobe Flash Player. I'll check my onboard version and see if there's an older version available online.
As you've discovered, the WonderMedia 8850 is a bit quirky. My WM tablet is branded by some outfit called AGPtek, which I gather manufacturers laptop batteries. Anyway I am generally pleased with it.
Fortunately, the Netflix worked "out of the box," but yes, it's quirky. It freezes when I try to select a film from an icon. Therefore, I am forced to type in the movie/TV show name in the 'Browse box' and then select from there. Also at times there's a problem with the screen/gravity format from the menu.
If your Netflix isn't working you might try going to the file and "unmarking it," I think that's what it's called. Then you use your browser to go the to Netflix website and set it up from there. In other words, you bypass the onboard Netflix widget that came with the WM8850. I'm no expert so I would continue to search around the web for solutions. I had success (a Google Play Store Problem) reading reviews from Amazon customers. Good luck.