If I close the Digital Editions my books as well as all notes and highlights disappear

If I load a book into digital editons, I can read and take notes and highlights. Have been working on something important for two weeks, needed to do a mac restart. When I opened digital editons all books were gone. It was as if it was the first time I'd used the app. I've tested it out, and anytime I close the app, any notes, highlights, bookmarks or personal bookselves dissapear. As if the app does a reset when it closes. Meaning I need to re-upload the books each time, meaning I can not close the app, for the next two months. if I am to keep using it. Please help..