Photos App stuck in loop when importing library - Please help
I have just upgraded my machine to Ventura 13.6.7. I moved my 500GB photo library from a backup drive from older OS, into the Puctures folder in Ventura, then opened Photos. It's a procedure I have done in the past many times. It all seemed to be working,took a good hour to display any photos while it imported, but at the bottom there's a progress bar which keeps showing a string of phrases. It's been doing it for 16 hours and doesn't seem to be progressing. The phrases it shows in a loop (as if doing the tasks, but clearly can't be) are:
Detecting duplicates
Curating best photos
Composing layout
Gathering favourites
Anaylsing scenes
Detecting duplicates
Curating best photos....
And round and round she goes.
I don't want to mess it up by breaking in, but clearly I need to do that. Hoping someone can advise please
iMac 27″, macOS 10.13