Please, could you post complete code of your document or send it to info@pdfcrowd.com?
Here is a working example which inserts a page break between two tables. You can try it out
here
<table>
<tr><td>table1</td></tr>
</table>
<div style='page-break-after:always;'> </div>
<table>
<tr><td>table2</td></tr>
</table>