Well, so I went through the usual useless exercise with SafeMode (mostly using msconfig)
In SafeMode, with or without network, Calibre acts as it should. In Selective Boot with everything turned off, it does not allow drag & drop. In a basic video mode, it also does not. Not sure how to get anything out of that, as the issue seems to be some setting that is not active in SafeMode.
Pretty much what happens every time I head down that rabbit hole.
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