for some reason blender can do this:
freeze os x completly sometimes
also for some reason the key shortcuts like tap for enter/leave edit mode
or crtl s to save a file does not work any more. i need to quite blender and than it works again for some time until i have this problem again!
any other os x user have the same problem? i had this also with pre releases.
i thought in the final version they will smooth this out. maybe its only on my mac here!