Hi Jay, I took a quick look and from what I can see the resolution is getting so high with the x2 and x3 options that the render mechanism would consume a quite large chunk of video memory in order to be able to function and that is failing for you.

What type of video card does your machine have, does it have a lot of video memory available on it?

It's also possible that the mechanism MoI uses for running on the Mac is not able to use the entire amount of your video memory and trying to use some unusually large giant block of it is failing.

When the render call fails, that probably generates a script exception and then the rest of the script that does the cleanup stuff for restoring background colors and such does not run, that's why your screen stays white.

- Michael