Is your printer in MK or PK mode? When using a dual black printer, such as the 3800/3880, the printer must be in the correct ink mode depending on what type of paper you're printing on.
To print GO, the image you print must be PURE white, printed with NO color management in the main driver (either Photoshop or Print Tool), and GO curve in QTR at 1440dpi/bi-directional speed.
If you continue having troubles, please let me know what image you're printing, and what print settings you're selecting so I can help you get past this and back to happily printing.
Best regards~ Dana