Many thanks for your replies. I don't think it is the Firewall because it always asks for permission when I open Calibre. It will be the Read-Only problem - now caused by the latest upgrade and bug "fix". Funnily enough I can transfer them by drag & drop onto the Calibre Application file in the Windows Program list, but that is also a 2-step process, and annoying. I will try the Temp file process and see if that is the answer. Thank you both again for your help.
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