Tom Perkins1 wrote:
FIRST, THANK YOU FOR YOUR PROMPT REPLY!
TAHOE 26.2
ALL PHOTOS NEW AND OLD
I THINK I USE ICLOUD PHOTOS. (I AM A TECHNO IMPAIRED SENIOR...)
I DON'T THINK I USE OPTIMIZER STORAGE. THAT IS, NOTHING RINGS A BELL
SURE ENOUGH THE ICLOUD PHOTOS ARE NORMAL AND NOT DARK!!
So, you do use iCloud! That's good. You can see about "Optimize" at Settings>[name]>iCloud>Photos

So it seems the bug is in Photo software...
I wouldn't thinK it's a bug, since I don't see it. Clearly your MacAir M2 is plenty up to date! We know the pictures are OK, since they are good at iCloud.com. The pictures on your Mac are exactly the same.
On the Mac, try these two things:
To narrow things down, try these steps:
- Restart the computer (of course)
- Re-start in Safe Mode. This bypasses certain potentially disruptive processes, and it often helps. Safe Mode is different for different computers, so see this:
Start up your Mac in safe mode - Apple Support
For safe mode, I'd write down the instructions (or print them) -- it's not at all hard, but I always have to look up the sequence, and I'll forget halfway through!
I'll be curious what happens…