Intersting thumbnail bug
So: Macos catalina - just updated.
I have created a new photos library on an external USB 3 drive (Formatted Macos extended journaled). I am in the process of importing nearly 20 years of photographs. Currently up to about 13K images.
My issue is that when I edit *any* image in this library, the thumnail turns black. Normal tips for getting it back (rotation, repair library) don't work.
All images tested so far have been Panasonic Raw - RW2. I'll try a jpg later.
The only way to get it back is to revert to original. Sometimes after this it stays black, until after I edit the photo a second time, then I get the thumbnail back. But..
After I have done this, I am then able to edit the image and not lose the thumbnail.
It is still going to be a pain in the ***, though to have to edit and then revert every image before I can start editing it.
Anyone any idea what might be causing it? How to fix it?
Thanks
Tony.