my friend am facing an issue a little worse; in my case ALL videos, albeit from apps or through the browser have stopped working, I first thought it was an issue with the app, I did it to one, I even changed the language in case not having English as default language was an issue but to no avail. I too have a lumia 950 xl and have no idea what the heck is going on. It works on my phone, but not through continuum