Created a login on this site just to tell you not to hold your breath.
They blame Microsoft and have been for over 8 months that I've noticed ... they updated their menu system without bothering to test it greatly. A few people have been able to call in and get refunds for the service at least, but since I can still actually use Netflix on other devices, I haven't bothered, since I can't really claim it is quite as useless to me... but it is to a degree, like I can't use my new phone to watch Netflix when I'm doing my cardio at the gym anymore.
Windows phone 10 does however solve the problem for them to the point that you'll be able to watch movies once more, but it still won't fix other issues that the new menu system has introduced (jumbling profile content, etc) Since the WP10 preview is still in such rough shape otherwise though, I'm not installing that on my regular cell phone just for the gym.