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I did some debugging myself. The problematic part is in common_utils.py
The error occurs cause it fails to (re)load the pixmap containing the find_duplicates.png.
This in turn is cause by the the command "global plugin_icon_resources, plugin_name" not returning the needed values. when calibre is initialized this points to the right values, but when i click the button it contains references to another installed plugin, "Similar stories".
I have no idea why calibre feels the need to reinitialize the plugin or how those values are supposed to be set, but uninstalling the similar stories plugin fixed the problem. And it is repeatable, if i reinstall it the problem reappears
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