Have you rebooted your iMac? Are your 4k images on your local drive or an external drive? When did you last backup your Lr catalog?
Thank you cmgap..
- iMac have been rebooted several times
- The images imported successfully in Lightroom yesterday
- Images reside on an external Galdigit 9Tb RAID drive (but even a different catalogue with <50 images stored internally on the SSD wont load)
- Lightroom Catalogue was backed up yesterday (I cannot open the previous catalogue either or any other catalogue for that matter)
Do you have any 3rd party plugins installed and stored with the catalog? If yes, try removing them, disconnect all externals and reboot and open Lr from your CC Manager (not from your dock). Post a screen shot of the error message if you get one.
I do use 3rd party plugins, but I am not sure how to disable them, as I cannot even get Lightroom to start. Besides... I thought resetting all Lightroom settings (which I have done) should disable all plugins as well?
I cannot disconnect the external drive as it is also my application, system and user drive.
It's possible that you may have a 3rd party plugin that is not compatible with the newest version of Lr. Most plugins also come with an uninstaller. If not locate the Lr Plugins folder and manually move the 3rd party plugins out of the folder into another temp folder. Try to open Lr again. Check the website of the 3rd party plugins that you purchased to see if they have an updated version that runs with the latest update.
Found the solution after reading cmgap last response :-)
From what I could gather, this is what happens:
It seems Lightroom expects that there is a physical Documents folder in the User directory. It is not the Document Folder itself that Lightroom uses, but the Library Subfolder. The Library folder CAN actually be moved to a different location (if you want to), and Lightroom will happily accept that, but if you then move your Documents folder, Lightroom cannot start.
Lightroom does NOT inform the user that this folder is missing, when it cannot locate it during startup. Instead it simply quits.
I had moved my Documents folder out of my User folder this morning, because I wanted to do a bit of cleanup on my harddrive. I had NO IDEA that this would break Lightroom's ability to run. I discovered that a Plugin could be located in the Documents folder (or that System Library information could possibly be located there), and although my System Library is in a different location, Lightroom seems to expect that the Documents Folder is located where it is supposed to be, and refuses to launch if things are not so.
Odd that Adobe hasn't included debug code to handle a missing folde like the Documents folder, even though it may not even use it to store anything.
Thanks for your help cmgap! Although you did not directly solve the problem, your response regarding Plugins led me to the solution.