Multicam crashing Final Cut Pro X

ok. So i just updated FCPX to 10.0.6. I have never used Multicam editing before so i am not sure if this is becuase of the update or what. I have turned all my footage that i want to goin into a Multicam into Proxy Footage. I then right right click and go'new Multicam' etc. When I click 'ok' it startes turning into one but then FCPX crashes and I loose the Multicam. Please help me! Thanks!