KiwiRuss wrote:
50 minutes later problem fixed! The issue started with the update of Photoshop yesterday. Adobe narrowed it down to an update of my graphics card GeForce. LR crashed when I tried to start it. Adobe updated the driver and tracked down the locked Catalog - Almost had heart failure when he clicked on a backup from 2018 - I called it in time so he resorted the list of backups and got to most recent.
Overall, a huge Thank You to Adobe. Also thank you to rcarol.