· If the app is frozen and unresponsive, choose Apple menu > Force Quit, select the
app in the dialogue that appears, then click Force Quit. You may lose unsaved changes.
· If the app quit, reopen it by clicking Reopen in the dialogue that appears.
· Restart your Mac by choosing Apple menu> Restart.
· Check the app’s documentation to see whether it’s compatible with your version of macOS.
· Open another file in the app. There may be a problem with the original file.
· Check for updates to your software.
· Disconnect any peripheral devices you just connected (for example, a printer). They may not be compatible with your
version of macOS.
· Uninstall any app plug-ins or enhancements from other manufacturers.
If you recently updated the app or macOS, a plug-in or enhancement you installed may no longer be compatible.
· Diagnose problems with your Mac to learn whether hardware you installed, such as additional memory, is
incompatible, improperly installed or defective.
· Restart your Mac in safe mode.