This is going to help a lot!
15" Macbook Pro Retina - OSX 10.9 in Portland, Oregon
We could get to the bottom of the problem. This was bug in Edit Face and has been fixed (takes care of CERs mentioned in this thread). Thanks for reporting and apologies for the experience.
Fusion 360 Development
This fix should now be available with the latest update (Fusion 360 R1.2).
Let us know if the crashes you see are fixed and thanks for your support.