Found the problem. I didn‘t compress the history stack for the images that had 
the thumbnail issue. After I compressed the history stack, the thumbnails were 
displayed correctly.

Best regards
Helmut
Am 10. Sept. 2020, 22:45 +0200 schrieb [email protected]:
> Hi,
> if I set in file manager view the number of thumbnails in each row to less 
> than 8, some thumbnails will not be correctly displayed (see screenshot_1), 
> part of the thumbnail is completely black. If I set the number of images in 
> each row to 8 or higher, all thumbnails are displayed correctly again (see 
> screenshot_2).
>
> Is this a known issue or can I regenerate the „misbehaving“ thumbnails to 
> overcome this problem.
>
> Best regards from Germany
> Helmut
>
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