Hi,Tim. I'am facing exactly the same problem! I'am a newbie, work with Poser 6 and all the recent updates, on a Mac OS 10.4.6. Try to learn Poser through the Book Practical Poser 6. Seems to be more an instruction for Window machine users though. I have still not found the solution to the render size problem. Have you? Would appreciate to hear from you if you did find the answer! SY, Ron Zwart.