WP X7 Problem in Publishing to PDF

When I have a document that contains Textart, boxes with textures backgrounds, etc., the PDF version of it will not publish the textured backgrounds, and the Textart has a white background, which is quite a nuisance if I am trying to put the Textart on a dark background.  I had this problem with X4 as well.  I hope I made this understandable.  Can anybody help?