Unable to use WeChat

Hi, I currently update my Iphone4 firmware to the 6.0.1 w/e the heck it was. So after it was finished updating, I tried to get into WeChat but then it asks me to login with my Apple ID and PW. So I go ahead and make one, when I login with it at the screen it seems like it was successful but it kicks me back to the home screen. What the ****? Is it because WeChat does not work with the latest update? It was really ticking me off. I can't even downgrade it...when I first started using WeChat, I logged in by using my phone #. But who knew this would be such a pain in the butt.