You installed the driver, right? It's at the eBookwise site under "help."
On your device under "phone settings" (I know, it isn't a phone, just accept it and move on) there are several things to check and uncheck in unexplainable ways. That way leads to madness, but I've always had to reconfigure these settings when I moved from one computer to another.
It's probably just that simple of a problem of having the correct settings, but you can drive yourself nuts trying all of the multitudinous variations.
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