Sigh.
Now I am just confused. Having added a few books successfully, I downloaded the remainder of my Amazon books, at which point they again started to get the same error message. The anti-virus is off, so I'm wondering what i did to 'break' calibre again and if I need to do the 'restore database' referred to by DoctorOhh above. However, can't find that. Apologies for being a pain, but this is bugging the heck out of me....
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