Some people say that if you open a new (empty) catalog, and then try to import the "corrupted" catalog, sometimes that works. I am skeptical.
There really aren't any ways to repair a corrupted catalog. You need to use your backup. And you might want to run diagnostics on your hard disk to make sure that the hard disk is functioning properly (malfunctioning hard disks can cause catalog corruption).
This is ridiculous. All the sudden I'm having the same problems as well. I create a backup of my catalog about once every week. As of right now I can't access ANY of my backups until I randomly got a 4month old catalog to open. Obviously this is a HUGE problem with so many edited, marked up files. Completely makes ALL my work POINTLESS if a Library can't stay in tact. I've got catalogs on both an NVME hard drive AND a backup 3.5" drive both have the same problem which means there is nothing hard disk related that you can try to blame. This is a problem with your software and I keep seeing numerous forum posts with not a single good response.
New Catalog with importing the corrupted catalog does NOTHING!
This is a problem with your software and I keep seeing numerous forum posts with not a single good response.
This is a problem with your hard disk where the catalogs are stored. It is malfunctioning. That's why all of your backups can't be opened.