I know there is an issue if you zoom into an image in the middle of stacking, but can you initially zoom the image before live stacking, then begin stacking. With a lack of ROI options that is the only way I can see blowing up an image.
JohnD
Live stack will use raw image, zooming in is just for the user to see.
Ok, so if you save the live stack, it saves the full image regardless of what you are showing on the screen.