I have tried several approaches without inducing any change in my situation : disabling my anti-virus ; uninstalling 2.52.0 Calibre and trying 2.45.0.
I can only obtain a response on my desktop Calibre interface by opting for the wireless connection but it "skips" many titles I have recently sent from Calibre to my Kindle. I may have to resend them manually and then reassign them to the appropriate collections.
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