Did OSX 10.9.3 change the usability of MainStage? I have MainStage 2.1.3 and it works fine on my desktop running OSX 10.9. I tried to copy it to my laptop running OSX 10.9.3 and I got a message that "MainStage cannot be opened because of a problem. Check with the developer to make sure main stage works with this version of OS X. You may need to reinstall the application."