When I first got the Glo, this problem didn't exist for me, I had zero problems transferring books to the reader. So it either has to be the version of Calibre, or possibly WinXP updates, that changed something on my system. I'm not saying it has to be Calibre, but it would rule Calibre out if I still had the issue and point more towards an update with WinXP from MS that made the changes that isn't playing nice with transferring between Calibre and Kobo readers.
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