Neither Lightroom 3.6 or Photoshop CS 5.1 on Mac OS 10.5.8 (desktop iMac) will print size Super B (13 x 19) on Epson Stylus Photo R3000. Though it looks fine in Print Preview and there are no error messages, it prints the image smaller (8" instead of 13"), in the center of the page. The same image prints properly (full 13 x 19) via iPhoto. It prints fine from the same programs (LR & PS) on my laptop (MacBook), which is OSX 10.6.8. All of the software, drivers and print settings are the same (and up to date). Why does it print correctly from laptop but not desktop? Is it because the laptop is a slightly newer OS? How can I get it to print correctly from Lightroom & Photoshop on desktop?