1) maximize pIllusion app window using standard titlebar “maximize” button
2) Make sure your stage window zoom is set to 100%
3) make sure your current project’s stage is 1280 x 720 (check the width and height boxes in the project settings dialog). Note that having the default stage size set in Preferences does not ensure that the current project settings match it.
4) Render
That’s it. pI3 will maximize the stage window size to try and fit your output size. If it can’t fit the size you want (your desktop res isn’t high enough for instance) it will launch pIRender to do the actual render.
Is pIRender being launched? If so, and you’re still having problems, then you’ll want to launch pIRender manually, click the Options button, then turn off hardware acceleration.
Alan.
http://www.wondertouch.com