Playing with my new favourite feature again today and ran into a strange problem. With an almost square image the mat was rotating 90 deg anticlockwise. I tried every setting I could think of to overcome this without success- at one point the mat seemed to decide it wanted to rotate the print. I wondered if the fact that the print was almost but not quite square was the cause and discovered that the problem only happened with an image slightly taller than it is wide. So on an image 7671x7677 it rotates 90 degrees but works fine on an image 7667x7677 pixels. It also works fine on 7677x7671 so it seems it just doesn't like very slightly portrait images. It is fine if the image is perfectly square.
William.