I have added 5 book pages into my book, each node has a parent book node referenced in it's book settings. On admin/content/book/N (where you go to re-order the book pages) there are only three items in the list, in spite of there being five nodes in the book.
1) create three book nodes, in succession, placing each into the book using the fields on the node.
2) navigate to the book_admin_edit page and save an order.
3) create some more book nodes, placing each into the book using the fields on the node.
4) navigate to the book_admin_edit page again. You'll notice your new book nodes are missing.
may or may not be related to
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