So ive just gotten my hands on Swan Song by Robert McCammon in RTF format. Ive opened it with Calibre and it appears in the library. Yet when I click to open it it trys to add the book to the library... again; with the message, "Duplicates found! Book with the same title already exist in the database. Add them anyway?" Saying yes simply repeats the process and creates more files I cannot open... any ideas?