After making a flame which I liked, I did a 640x480 test render which looked fine (although the render took longer than I expected). Now when I try to render at 16x12, quality 4k, oversampled 4x - I cannot get the image to render. I've limited the memory usage to 64Mb and still no joy - is this because my PIII 1.2/64Mb gfx card just isn't beefy enough?