Brother MFC-6490CW Printing Half Pages

Worked fine until recently (Win 7)

New Ink

Empty print spooler

Drivers successfully reinstalled

Settings as per Brother troubleshooting

Prints full page color copy OK

Prints full Win B&W test page OK

Prints full B&W text page from any application OK

All colors working., but only prints 1/2 to 1/3 color image from any application!