If you’re on Windows, make sure you’re using the latest version (3.0.3). It should call pIRender automatically. I assume you’re not on Windows though, so…
Since pIllusion needs a visible window to render into, and your desktop is smaller than about 1940×1120 (approximately) then you’ll have to render in pIRender. (If your desktop is larger than that, then maximize pIllusion before rendering.)
To use pIRender, save the project file, then run pIRender, load the project file, and render.
(The Mac version will have the ability to call pIRender automatically when needed sometime in the near future — in the 3.0.7 release.)
Alan.
http://www.wondertouch.com