Drag and drop does not work
I am using windows 7 (64) and until recently had no problem adding new books to my library by drag and drop into calibre window. After a recent upgrade of Calibre (do not remember which version, but definitely 8.5?) drag and drop does not work anymore and when I drag books into calibre window the stop sign appears indicating drop is not possible. I can still import books into calibre using the "add books" button. I am wondering what can I do to make drag and drop work again.