Documentation from abcpdf, http://www.websupergoo.com/helppdf9net/source/3-concepts/g-htmlrender.htm, says that the html element below will cause a page break. It does but for the last page as you can see in the screen shot it doesnt. HTML passes validation, and the breaks are there so is this a bug?
<div style="page-break-before: always"> </div>
