Well crap.. I can't find a book for you to test.
The thing is, today has been all about matching Goodreads with Calibre, so I've been doing some extensive cleaning on both ends, deleting (and creating
) duplicates back and forth.
My theory is that the books that were causing these problems were books where there was one copy on Goodreads and two copies in Calibre, and then upon syncing I linked first to book A and then on the next sync I linked to book B.
As I was also deleting books between syncing actions (in both places) these duplicates slowly disappeared... which would explain why I can get the error again and again when I run the same books again and again, but if I run a few at a time (getting bored and doing some cleaning on Goodreads in the meanwhile) I can run through all the ones that gave me problems before in smaller batches without getting errors.
Hmm... if that makes ANY sense