I had the same problem. Somehow it was fixed by adjusting the cash memory reserved for camera raw on photoshop preferences from the default 5GB to 10GB. I have a Mac Pro, 15-inch, 2017. 2,8GHz Intel Core i7 Quad-Core. Radeon Pro 555 2 GB, Intel HD, Graphics 630, 1536 MB. Mamory 16GB 2133, MHz LPDDR3
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