i'm having the same problem your not the only one who is having this issue i just released a report of this issue not a long while a go which is basically 2 minutes ago, their might be many people who is also having this problem. because it's frustrating me since it won't let me play at all! i wish mojang fix's this soon.
Your Not the only one who is having this kind of Trouble i hope Mojang fix this soon. i really want to play the new version of minecraft. so BADLY!!!!!