New folder can't be created (Location is read-only)
Under certain circumstances the creation of new folders (when editing book locations) will be denied by the system. Solvong thins issue is quite easy. When in Save-Open-Dialog, go to the root-folder of your hard drive (normally titled Macintosh HD) using the popup-selector right next to the search-field. When selected go to folder users and the choose your Home-folder where your main-data is. Now you should be able to create new folders.