for once I have used an old laptop to edit a blender project and now when I hit render on my regular machine I do not see the familiar tiles. the picture is build up from the bottom and is then sharpened with each sample run. Tiles are set to Hilbert Spiral, but other choices do not change how it renders The original unedited file still renders in tiles.
I have no idea if this has any consequence as to image quality or render time. But if so, how do I change back to rendering in tiles. Or do I have to redo the original file on my regular machine to fix this?