This might involve the update process as a problem.
I would suggest you do a complete uninstall, after making a backup of your collection (and MIDI files if you have your own).
I'm not a MAC user, so don't know how to do 'full clean' after uninstall.. But there may be such tool (or OSX uninstalls just more rigid than Win

).
After this do the install (and set your preferences).
I know for sure people have send in MAC crash reports stating 3.3.11..