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Mystery solved:
There is 1 metadata plugboards PER library!
I have several libraries, hence each one seem to have its own, different definition in its according metadata plugboards.
Not at all what you might expect, but there is some logic to it.
So what probably happened was that I created a definition in a library, switched to another library and uploaded ebooks, which failed to comply to the intended definition (because it was not defined in THIS current library), then switched to another library, only to find that all my definitions had disappeared (as no definitions where made for THIS current library).
The only thing I still do not get is why calibre complains that a definition is already in place + whether I still want to save it?
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