What happens if you click:
File >> Open Recent
Are there any other catalogs to choose?
Recently I changed my PayPal details which led to my subscription to LR expiring. As this happened I lost of all the edits to my RAW files.
One does not cause the other to happen.
Perhaps you did something else at this time? Did you import the photos into a new catalog or import the photos into an existing catalog?
Only the other catalogues I've tried to open to correct the problem.
No, nothing. I keep all my photos on a Seagate hard drive but haven't moved them, changed them, renamed them or anything else.
Is the history in the Develop Module now empty (except for one row that indicates Import)?
Can you show us a screen capture of the History Panel in the Develop Module for one of these photos?
Hang on... problem solved thanks to dj_paige...
I think I'd become convinced the problem was due to the lapsed subscription or catalogue but like you said one doesn't lead to the other so I thought I'd try something obvious.
Right clicking on the folder in library and then telling LR where the root photo folder was has done the trick. I've no idea why it had forgotten where they were but it seems it needed a nudge in the right direction.
Thanks for the help guys. I love LR but sometimes it's infuriating.