Possibly (ir)relevant background:
After seeing some images that had been processed with Corel PaintShop I decided to download and give it a try. Total failure. Over the course of a week I opened it (sometimes extremely slow, sometimes it would not open) and attempted about five or six times to process and image. Each time the program would lock up, with the whatsit spinning and spinning, impossible to shut down the program, the only option was a hard shutdown of the computer via the on/off button. When it happened again this morning, I got disgusted and uninstalled the program.
NOW: Lightroom had been operating correctly up to this morning, but following the uninstall of Paint Shop, when I opened LR everything was gone. When I attempted to reinstall a catalog, it did not work. Subsequently I've imported all the image files again, BUT:
ALL PP WORK ON EVERY IMAGE FILE IS GONE. LR indicates not one file has been processed in any way. Comparison of a few recently processed images in the ready-to-post folder with the image back in LR confirms that all PP work has disappeared. There are over 200,000 files of which at least half have been processed in some way. I've spent over an hour processing some pictures, for example, when removing a distracting background from an image of a statue taken in a museum. Could the uninstall of Paint Shop have taken all the PP information for LR with it?? That's the only reason for mentioning that failed experiment.
Any suggestions on how I might recover the PP data for LR would be greatly appreciated.