Both my computer and kobo e reader are authorized. I read a troubleshooting message that said I could deauthorize and try to drag and drop, but this didn't work. I have been reading everything I can find on how to fix this problem. I also read a message that Kobo ereaders don't work with ADE 4.0 at this time. So I uninstalled and downloaded version 3.0. I still can't fix my problem. Can someone please help me????