If your graph, library and hierarchy windows are arranged in a way that they cut off part of the stage, pI will automatically zoom the stage down before it starts rendering. So you really need to just grab the borders around the stage window, and resize it so that your stage area is larger than 720×486 before you hit render. If you’re using pI3, hit Alt+3 before you render. That sets the stage to full screen, and will ensure the stage isn’t too small to render at the proper size.
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Elvis Deane!
The particleIllusion FAQ
particleIllusion Resources and tutorial CD
Astounding Adventures