background dissapears on PDF save

When I publish a document to PDF, it will not save the background, its blank, only the rest of the document shows. If I minus front from back, a portion of the background from another object it saves it with the background, yet when I export it as a JPEG the background is there. Please help.
 This is the JPEG
Untitled-1.pdfThis is the PDF. 
If you open the PDF document - the blue background is missing.

I am worried its a glitch in corel 8, I do not have this problem in Corel 7 or Corel 3