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sorry, I missed that safe ode had been tested once already - but safe mode + having the task manager window open would tell us if the program "disappears" or actually closes itself. if ask manager says it is still running but you can't see it / tab to it then that's new info.
if I open my copy of 64 bit calibre and drag + drop a book i.e. add book, the very first think I see is the add book pop up information window. . I think calibre creates that window before creating any files or folders.
So when the OP does that , the program crashes before that window appears ? suggesting that crash is when calibre calls whatever asks windows to create a new window: in safe mode its a quiet fail, in normal mode it is a more obvious fail, but it's always at that point ?
have we considered whether any non standard system fonts or font sizes are in use ?. I distantly recall having some game controller software which crashed on my PC but not on the authors, & we eventually traced that to me running with 125% font sizing for desktop.
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