Hi,
Please try to view your HTML file in Google Chrome browser and see if Chrome browser displays the table border. Different browser engine can display the same HTML slightly differently, the output of our converter is most close to Google Chrome's output.
If Google Chrome works correctly but it does not render correctly with our converter, you can try to isolate the problem into a test file and send the test file to us. Once we have that we will be happy to take a look. See here for more information about sending test file to us:
http://www.essentialobjects.com/forum/test_project.aspxThanks!