Some PDFs, usually ones created using older software versions (PageMaker before it became InDesign, or Quark 5 and older) or non-standard graphics programs (like Publisher or Excel), don’t print out correctly after being imported into Number Machine Pro.
Transparent vector images are incompatible with the PDF plugin being used in Number Machine Pro version 18.104.22.168. They will be imported as solid.
There are two different ways to overcome these issues: 1) Quickly, or 2) Professionally.
1) The fastest way to fix the transparency is to open your current PDF in Photoshop, make sure the color settings are set the way you want them (Photoshop tends to default everything to RGB when you probably want grayscale), and resave as a PDF. This will effectively rasterize the whole document. The downside is it may increase the file size and decrease the quality.
(WARNING: Photoshop doesn’t interpret PDF margins very well and may alter your intended gutter spacing and finished size. You will likely need to resize the image to get the margins and project size correct before saving and importing into Number Machine Pro.)