Formatting Book Issues

I've been getting Smashwords rejections of late. Let me explain. Smashwords is a website that allows authors to publish their ebooks. The thing is I keep getting told that there is some inconsistency in my formatting. Except I've checked it and can't see what the problem is. It is a right old palaver.

So, I am toying with the idea of going through Ebook Maker next time I plan to publish a book. It promises to greatly speed up the whole process so that you have a polished book in the right format. It might just be the solution I need.