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I upgraded my operating system from WIN7 to WIN10.
I use LR Classic. I upgraded to LR Catalog v10 version.
In the left panel of the library, everything appears to be OK, as is the metadata information. Preview images just don't show up.
The v10.lrcat and v10.lrdata folders contain a lot of data, that is, they are not empty.
How do I make preview images appear?
Is it possible that Lightroom Classic is still building the previews? Look at the very top left to see if a previews process is running.
Are you talking about what you see in the center area? You need to have a folder of images selected or near the top of the left hand side click on All Photographs in the Catalog Panel. Do you see images in Grid or Loupe view in the center of the Lightroom Classic screen?
Preview images do not appear in grid or loop view. The grid does change according to the selection made in the menu. The box where the image should appear contains information about the image (metadata)
Have you tried closing and restarting your computer and restarting Lightroom Classic?
My suggestion is to once you start Lightroom Classic, disable the GPU: Preferences -> Performance -> Use Graphics Processor = Off.
If that doesn't work, uninstall and reinstall Lightroom Classic through the Adobe Creative Cloud app. Also check with the maker of your GPU that the drivers are up to date.
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Did you try disabling the GPU with the procedure I mentioned in my previous post?
Make sure that the images themselves are not being reported as "missing", do you see an "!" icon at the top-right corner of the thumbnails in the grid view? If they are missing, you need to resolve that problem before the previews can be generated.
If the images are NOT missing, have you tried to force LrC to rebuild them (select a few thumbnails in the grid and go to the Library menu>Previews>Build Standard-Sized Previews), does that help?
If the images are online, but building the previews doesn't resolve the issue, it's possible that the previews cache is corrupted. Close LrC, locate the catalog file using File Explorer, then rename the previews cache (will be called your catalog name Previews.lrdata), which will force LrC to create a new previews cache when you next start it. Initially all the thumbnails will again be blank but should start to automatically populate with the preview image as LrC will automatically start to build new previews.
Can you see the image in Develop?
Library and Develop use separate previews.
Did you follow Axel's advice, and try to set the monitor profile to sRGB?
If not, here's how you do it.
If it fixes the issue, it is recommended that you calibrate the monitor with a hardware calibrator.
This will also create and install a custom profile that describes your monitor accurately.
With Lightroom closed, press the Windows key + R, type colorcpl in the box and press Enter.
Add the sRGB profile, and set it as default.
I had calibrated the monitor with the Spyder4Pro. I had done the calibration before the WIN10 update.
I changed the profile to sRGB, which I installed by default.
Now everything works.
Many thanks to all of you wonderful people who contributed to solving the problem.
Windows 10 is known to install low quality profiles from monitor manufacturers.
These profiles are often defective out of the box.
If you now run the calibration again, a new profile will be created and installed. It will replace sRGB, and it will be more accurate.
I performed the calibration again and selected the new profile as the default.
Everything is working really well now.
Thanks for the help I got to solve this problem.