Why does LR 6 on my mac unexpectedly and repeatedly crash? This happens when I view my images after importing them and in the middle of editing them.
First be sure you are using Lightroom 6.5 (if you don't have 6.5 then update your Lightroom via Keeping Lightroom Up-to-Date)
Try turning off the use of the Graphics processor
Go to Preferences, click on the performance tab, then uncheck the box
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