I've been able to download many books on my kobo but now, when i connect my kobo on the computer and ADE and when i drop a book which is on ADE into my kobo, it says that the book is already on it. When i unplugg my kobo, the book is not on it, eventhough i synchronize it.
It's a new computer on which i've dowloaded without problem ADE (all my books are on it). To make sure, i've unauthorized it and authorized it again, but nothing changes !!