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I got the same problem with the recent update (1.26.0).
Then I deleted the new version and installed an older one, but it is not much better.
Closing the metadata window is testing my nerves out.
It seems to be a kind of loop in the program while window-closing.
I have about 5000 books in my library.
I use Calibre 64-Bit on a Windows 7-64 PC.
Is it possible that some plugins could do that?
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