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This really a big deal? Just exit calibre and wait. Maybe double click the icon to restart a few times (with a long delay between) until it does.
But I probably can reproduce by artificially running it in a container with only 3-4G ram. What I usually see is background worker threads still running after the main interface window is closed. (Probably being paged in before they can exit, which is of dubious use.)
So let me know if debug info from a linux system would help.
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