Photos are still on Lightroom and visible but the folder system has all disappeared . I removed a folder - desktop - because there were no photos in it. When I did that all folders went away. Where are they? Do I have to start over?
If the images are still visible without any "?" on them, go to the grid mode in the library module and right click on an image and choose, "Go to the folder Library." Does that do anything for you?
I found them!
Retrieving data ...