Same for me. I got it at the beginning, then one day I lost several books all of a sudden (they became unknown author, unknown title in my library, and whenever I tried to open one, the kobo would restart instead of opening the book). I tried to sync several times, but each time it just went on and on trying to sync and never getting past the first book in the list. In the end I did a factory reset and got my books back, and all my awards stayed except for the inverted comma one. No matter how many times I highlight since then, it's not coming back.