I have a similar issue:
The book I am currently reading only displays "1 of 1" page from the "currently reading" screen. When I select the book from here Library screen the book resets and displays the cover.
However, if I select the book from the list of books in the library or from a shelf I am returned to the near the place I was reading (usually within one or two pages). The page count is displayed as expected while reading (in this case 255).
This only happens with a few books imported with Calibre.
It seems like the nook has two different places it keeps the information for page location.