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madmads, welcome to the forum!
Give this a try, it's worked for me in the past:
Follow this path from the main calibre screen to do some cleanup:
Preferences > Advanced > Miscellaneous > Open calibre configuration directory.
Open the "Resources" file folder and then open the "images" folder.
Delete all the "png" files in the main "images" folder. If there is a "json" file, delete it also.
Don't open the subfolders in the "images" folder, just leave them alone.
Then shut down calibre and restart it. Go back to Preferences > Look and Feel and try to change the icon theme again.
Good luck ...
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