SubmitFileStream html using vw for measuring comes out blank

[mynameisibra]

Thanks for this great project, everything works perfectly fine until I set a SubmitFileStream with the following:
.SubmitFileStream("text/html", "filename", New IO.MemoryStream(Encoding.UTF8.GetBytes(stResult)))

The problem is ANY element with measruement size in VW and not PX or PT do not show up on the pdf file, just as if they're not even there. How can we get that problem resolved?