I won several games in a row the other night and received 0 rating. My wins and losses did not change. At the end of games, it would show that I earned 20+ points, but after the game my points were the same. I had close to 10 wins in a row before finally losing. That loss did count. I started earning points after that as well as losing them. Additionally, it seemed my MMR dropped a couple hundred rating because the day before my MMR was much higher.