In case an app crashes and you are unable to utilise it, please disable System Integrity Protection as follows
Turn off your Mac (Apple > Shut Down).
Hold down Command-R and press the Power button. Keep holding Command-R until the Apple logo appears.
Wait for OS X to boot into the OS X Utilities window.
Choose Utilities > Terminal.
Enter csrutil enable
When macOS loads up normally please try working with the software as usual.