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i am wondering if the lock up is at the point where calibre needs to display a pop-up window to say "adding books", and maybe it's the action of creating the window that is at the heart of this, not the underlying file/folder activity.
which would point at some issue with video drivers ?
what is the relevant part of your set up ?
there is no way to say in calibre don't display the pop up window so it's back to laborious compare of 32 & 64 bit to see if this idea has any legs.
one other thing that I don't think has been tried yet is booting in safe mode & repeating the various tests. AFAIK, safe mode will bypass your usual video driver if that's an nvidia / AMD and substitute a basic microsoft driver
and , scraping the barrel now because BR has already listed the most likely tests: create a new windows user, try calibre 64 when logged on as that user. do that for both a new admin user and a normal one with no admin rights
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