I am currently unable to print A3+ using iPhoto 9.5 in any mac. The option for A3+ is not available in the print dialog, nor in the printer preferences. I have tried uninstalling and installing the driver twice already and no luck. I can select Super B/A3 size under "Printers & Scanners" in System Preferences, but there is no option for this paper size in the iPhoto dialog or once the printer is ready to start.