I was just exploring Fusion from within MC, and other than having to navigate to the project Fusion creates when you launch it from within MC, it works pretty well.  Unfortunatley, every time I quit Fusion and return to MC, there is an instance that stays in the dock which you can't force quit.  Multiple instances are created.  And this causes the Mac to hang on shut down.  The instances don't show up in Activity Monitor, just the dock (and the dock via 'cmd-tab').

I re-installed MC (8.6.3) and Fusion (8.2) and Fusion Connect.  OS is 10.11.6

Odd... maybe I should stick with After Effects after all :)