Thank you very much. I just verified - it works. The solution to the problem for me is very easy. I switched off the synchronization of the Calibre Library folder (it is easy I'm daemon Mega) on all computers. After working with Calibre and changing the library I switch on this folder and make synchronization. In other computers, I have to make synchronization before starting Calibre. Thank you once more. Due to this problem, I thought about changing the program to manage my library.
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