I just upgraded my stand-alone copy of Lightroom 5 to 5.7. Now every file I try to develop gives me a "there was an error working with this photo" message. What should I do?
I would say that updating the application will not cause the images to be corrupted.
So, if you have any backup catalog , I would say try opening the backup catalog.
My fault. I restarted my computer and everything is again OK