Originally Posted by Ripplinger
Did you try it without using the # symbol? I know some systems don't allow certain characters in file names, and possibly the Nook has the same limitation. I would think the colon would be ok, but maybe try using a comma there instead too to be certain.
Wow that simple answer made my books work again, thank you so much! Is there any way that I can set up Calibre to allow the # symbol in the metadata of the ebook, but when I sync it to my device it erases that symbol from the actual file name? Because if I remove the symbol from the file name of the epub, the book loads just fine even with that symbol in the metadata of the title.