Printing .pdfs to a color Xerox 6200

When we send a .pdf w/ graphics to our Xerox Phaser 6200, we get a little white box around one of the graphics. When we send the same doc to our Color Savin MFP, it looks fine. I’ve tried the latest postscript and PCL drivers for the Xerox- all to no avail. I’ve tried the “print as image” setting, and it makes the box go away, but then it reverts to grayscale (no color). I’ve been on both companies tech support sites, but couldn’t find anything on this. Any ideas, my friends?
Thx in advance!
~Allan