Since when are you facing this issue?
Moreover, Does the printer supports color printing? Are you able to print documents in color via other programs?
What product version and OS version are you using?
Thank you for your response.
Unfortunately she informed that this has never worked and she has had the MacBook Pro for almost a year.
Yes the Xerox 7855 Network Center prints color.
She can print color in Word documents.
She is Yosemite 10.10.5
Does it affect PDFs in RGB or CMYK or both?