Forget trying to set it on the printer itself, and maybe try setting it in the printing box on your computer when you go to print a document. I found the same problem-settings on the printer itself donnot stay.
I had the same problem with my Pixma 4700 printer. Not sure if these settings can be found in the same place on your printers, but here's something you can try:Press the tools button on your printer (should show an image of a wrench)Scroll the comma...