Hey, @Spiderpig_David. Welcome to the Lightroom Community. I'll help you figure this out.
Have you recently updated macOS or the Lightroom desktop?
Try these suggestions:
- Ensure Lightroom has the required permissions on macOS: macOS:https://adobe.ly/3WfrQf2
- Log on to Lightroom Web (https://adobe.ly/3XVZmIp) and ensure everything is synced and backed up before proceeding.
- Choose Go > Go To Folder in the Finder window and type ~/pictures. Locate a bundle named Lightroom Library.lrlibrary.
- Right-click or control-click this bundle and choose Show Package Contents. You'll find a folder inside it with a long cryptic string of numbers and letters (for example: d1a4f88d2b534c7d91022136fd182532). Open that folder.
- In the folder, move out all the files named Managed Catalog.[anything] to the Mac's desktop. Also, delete the Previews.db file.
- Launch Lightroom.
Let me know how it goes. Thanks!
Sameer K
(Type '@' and type my name to mention me when you reply)