Hi Rolf,
Before reinstalling the Lightroom CC from your machine, could you please turn off the GPU from the Lightroom preferences and check if that helps to fix this issue.
Go to Lightroom menu > Preferences > General > deselect the GPU > Restart Lightroom.
If you stay for another 20 seconds on the image, do you think Lightroom will correct the selection. Maybe Lightroom is slow when it comes to going through the images quickly?
If turning off GPU doesn't help then, you can try the uninstall and reinstall process and let us know the result.
Regards,
Mohit
Hi Mohit,
I tried the GPU deselection without success. The speed in changing the pictures was always good.
In the meantime I deactivated and then uninstalled Lightroom, erased everything under <user>\AppData\Local\Adobe\Lightroom (there were some 28 GB data) and everything from the corresponding ...\Roaming\.. directory. The reinstallation was smooth and everything is working now. I hope it will stay so!
Thanks for your help
Best regards
Rolf