@chaley: thanks. I downloaded and installed the new version. Unfortunately did it not solve the issue I highlighted. And I did not expect so, as there were no remarks about thumbnails in the version 0.7.21 changelog.
@Squirsier: thanks. I do understand the procedure you explain in that thread. But I will be honest and admit that I am too lazy to do this for all books individually. It would be great if Calibre could do this automatically.
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