Same here! I bought my eReader two days ago and transferred free ePub books (about 150 or so) using Calibre to Kobo's main memory (not on the microSD card). I've noticed that five or six books, although I could see them in Windows Explorer when connecting Kobo to my PC, were not displayed on the Kobo reader. I couldn't see the check marks in Calibre although I do know the missing books were check marked when I initially loaded them on Kobo. I solved the issue by loading the books to the microSD card (after removing them from the main memory, with Windows Explorer). I transferred two books with Calibre on the microSD card and the remaining three or four via file transfer using Windows Explorer also on the microSD card. After that Kobo displayed all books and I can see the green checks in Calibre... L
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