I just found a bug in the "Add Title" process and fixed it. If you find that you click the "Add Title" button in your bookshelf and get a server error page, clear your browser's cache (instructions online for all browser types) and it will work properly again. The bug was only active for a few days but if you're having problems, this is likely it.
Otherwise, any issues, please let me know!! Andrew at cookbooker.com