In my case Netflix refuses to stream shows or movies on IE11 / Win10 and a subscription based TV service from my native Finland does not open, again IE11 / Win10. Both services work well on any other browser.
I strongly suspect in my case it's a Microsoft Silverlight issue as both services use it, it being the only common nominator. As I mentioned, both services work perfectly on all other browsers.
Screenshots to show errors, first Netflix:
And the Finnish TV service: