Good afternoon and thank you for posting on the Final Fantasy XIV Technical Support Forums.

Have any changes happened to the device before the issue began? We would also like to recommend several other troubleshooting steps:

1) Update/reinstall your graphics card drivers (preferably a clean install)
2) Disable all programs/overlays running in the background
3) Make sure your anti-virus software has the appropriate exceptions for Final Fantasy XIV
4) Perform a clean boot: Restart the Mac, then immediately press and hold the Shift key. The Apple logo should appear on your display. Release the Shift key when you see the login window.

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