When importing pictures in LRCC, 90% of thumbnails appear black, I must go into Photo / parameter dévellopement / réenitialiser.Comment have all my thumbnails ok when importing?
Go to the preferences of the Lightroom.
Under the preset tab uncheck the option which says "apply auto tone preset"
Remove the images from the Lightroom and reimport them check if the same issue is coming up or not.
Retrieving data ...