Quote:
Originally Posted by unboggling
Thank you. It's good to have that clarified in my mind. Now that I think about it, it's probably obvious that Copy to Library is an exception to the rule about not letting different instances write to the same library. Because if it weren't an exception, it wouldn't exist.

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I believe it is the Same instance (Only one Calibre.Exe is running), accessing 2 Libraries. with no (other instances) buffered data to cause confused states.