Today, I experienced the mastery freeze bug for the first time. For those of you who have not had the misfortune of getting it. Its when you try to change your masteries during champ select and the client freezes. I had to restart my client and I lost 20 points... Can we please fix bugs like this before we punish with point rankings. You could just make it so the person who leaves cant start another game until his old teammates game ends even if he leaves during champ select.