We have an Air on 10.10 that can print to a Xerox, HP and Konica. However all three are only printing B/W. Tried changing the color matching, tried toggling the "Print black and white" check box. No change. The preview of the page to be printing shows B/W, so I feel like it's the computer. Everyone else can print color to these printers. Anyone seen this? Is there a global option to only print B/W?