[SabrinaB]

I am fairly new to Calibre. I have made a library on my nook using the create a catalog of book feature. It was working properly. I have updated it several times. Now when I go to "My Books" on my nook. The file has changed. It doesn't list the Headers "A" ... And it does not list any of the details for my books anymore. What can I do to fix it back?
Sabrina