My photos disappear as soon as imported from my iMac or macBook.

Hi, it's been a month now and I DEFINITELY need to work on my 2 computers. 

As soon as I open a series of photos imported from my iMac or macBook on Photoshop, they disappear.
The app is perfectly working, up to date (via the Creative Cloud), but when I open some photos from any file from my laptop (or iMac), they are totally invisible.
Can't see them, can't zoom in/out, can't duplicate the photos or add any layer. 

I 've tried to open them from Photoshop AND also by sliding them directly from the file.
I tried from 10 différent files located on my laptop, a hard drive, a USB drive.
Same issue all the time. Black photos, impossible to edit them. 

Some rare times, I can see a "broken" photo, see screenshot attached, but as soon as I touch something (zoom in, duplicate photo, select a tool....), it becomes black/invivible. 

Laptop and iMac work on BIG SUR. 
Everything was working well when I switched for BIG SUR a few weeks ago, then suddenly... 

Thanks for your advice or suggestions 🙂