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What I don't understand about this situation is that it's not reproducible. The issue I started with (Calibre, itself, not starting up in the foreground but taking up 10% of the CPU in the background) has been superseded by the Editor having the problem. It's not tied to any particular book. I can edit the same book all day, quitting and restarting the editor without trouble. And then, up rears the problem. I shut down Calibre, kill the orphaned 10% CPU task in the Task Manager and start up Calibre and the Editor just fine. Until it happens again. There's nothing (i.e., logs) on the system (Windows 10 or 11) indicating any kind of problem.
If it happened all the time, it would be solvable. Ditto if whatever isn't liking Calibre popped up a message or left an indication behind. Or, if something showed up in the Event Viewer.
My current strawman is that it might be related to the "Easy Anti-Cheat" software Vermintide 2 installed. That's the first game I've ever played that installed such a thing. But, if it were the cause, I'd think it would happen all the time and some kind of notification would happen on the system.
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