We've created this Forum Thread with some workarounds and advice to assist you in publishing you ebook.
Incorrectly Formatted Books
I've noticed a few books here on Lulu which are not correctly formatted i.e. there are no paragraphs so the entire book is one long paragraph.
No one would enjoy reading such a book. I would challenge the authors who create such books to read them themselves. I bet they would decline the challenge! Do some people not check their epubs once they have been created, or buy a copy of their print book, as they are supposed to do?
If you are such an author and you don't know how to fix the problem set a paragraph style in the styles option of the document you are working on; it could be that you are not doing this and that things go awry during the conversion to epub.
If you are producing a print book why not produce an PDF from your Word (or other) document and upload the PDF? That way you know that the print book will look exactly like the PDF you submitted. doPDF is free to download and use. Simply print to doPDF and you will have a PDF you can use to get your book looking like a proper book should.
There are millions upon millions of books for sale. As a reader I might forgive a wonky cover but I would never forgive a book formatted in the way I have described above. It is, quite frankly, unreadable.