Unity 4.6 Freeze after launch game

Hi !

I have a probleme with my projet, i have download unity 4.6 yesterday but i don't launch the game test and today i want to test my game on " game " windows but Unity save my save and freeze after that !

I see on the task manager " not responding " but on the last version of unity all work's good and i don't are error in the console :s

I have make a test and Unity freeze only with the canva on the scene :/

Thanck's