Hi and apologies if this is posted elsewhere, but I can't see or find how to do double sided printing with the above printer. The choice is greyed out when it appears on the screen, and emailing Cannon support just seems like too much hard work, requiring serial numbers etc. I'm sure I've done it before in the past, but cannot for the life of me remember how, and general google searches have proved fruitless. I am using a Mac running version 10.9.3 and the Driver Version is 10.89.1.0. All help gratefully appreciated. Many Thanks in anticipation.