I have this problem.
I modified some print formats of my program in order to add some fields. Later I tried to print this format as a PDF file and I noted that the background of this print have the same colour of their fields (that is yellow).
The very strange thing is that the the print preview of this format has still a white background, so how can I do to put this colour on its PDF file ?
Ps: I attached a sample of print and print preview