Hi,
Please check two things:
1. Try to load the page with Google Chrome browser and see if it works fine for you. If your script has a problem, this will usually tell you what's wrong;
2. Try to increase HtmlToPdf.Options.MinLoadWaitTime. Sometimes even if your script is fine, but it didn't have enough time to run. Increasing MinLoadWaitTime gives the script more time to run;
If none of these resolves the issue, please try to update to the latest build and see if that resolves the issue. If the problem remains with the latest build, you can try to isolate the problem into a test project and send the test project to us. We will look into it as soon as we receive that. Please see here for test project guidelines:
http://www.essentialobjects.com/forum/test_project.aspxThanks!