Marketpress PDF Logo

So, I am trying to figure out the logo image for the PDF add-on for invoices and packing slips. I have uploaded the logo in both .png and .jpg format, and selected the image for the header logo. However, when I generate the PDF the logo is a place holder thumbnail and a string of text saying the asset is not available, including the complete url of the image.
What's the deal?
How di I fix this?