Previews are gray squares

[ondre camilleri]

Just upgraded from Lr ver 5.4 (stand-alone) to LrC ver.11.4. Images are not showing up. (see attachedment). Using macOS Monterey ver12.4.

Is this a bug or am I missing something?

[AxelMatt]

The first thing that you should try is to switch off the GPU support from the Lightroom preferences and check if that helps to fix the issue.

Go to Lightroom > Preferences > Performance tab > Uncheck "Use Graphics Processor" > Restart Lightroom.

https://helpx.adobe.com/lightroom-classic/kb/lightroom-gpu-faq.html#troubleshooting

https://helpx.adobe.com/lightroom-classic/kb/troubleshoot-gpu.html

If this helps please check if there's an update for the graphical device driver is available. 

More informations you'll find here: Gelöst: in de ontwikkelmodule zijn alle foto's wit – Seite 9 - Adobe Support Community - 13006731

If this doesn't help, you should check your montor profile. It may be faulty.

How do I change my monitor profile to check whether it’s corrupted? | The Lightroom Queen

Another point could be missing access rights.

Please see here: :magnifying_glass_tilted_right: Quick Tips: How to give Full Disk Access to Li... - Adobe Support Co...

[Ian Lyons]

Your previews are probably corrupt. You can delete and rebuild the previews without harming your catalog.

To delete the previews - locate the folder containing your catalog, then select and delete the package ending '.lrdata'

To rebuild the previews - choose Library > Previews > Build Standard-sized Previews

[JohanElzenga]

Apple changed the security requirements in MacOS Monterey. Go to MacOS 'System Settings - Security & Privacy' and add Lightroom Classic and Photoshop to "Full Disk Access". Click on the lock icon to unlock the settings, then click on the plus icon to add Lightroom Classic and/or Photoshop if it isn't already listed. If it is listed, then just enable the checkbox. See also Quick Tips: How to give Full Disk Access to Lightroom Classic on macOS

[ondre camilleri]

Thanks Johan. Problem resolved.