In the latest update to Goodnotes, the shape tool doesn't easily create standard shapes, especially rectangles/squares. E.g., if the shape is drawn too quickly and the corner points are not even, the resulting shape is an irregular four-sided polygon instead of a rectangle with 90 deg corners and parallel sides. I would imagine the need for rectangles is much greater than irregular four-side polygons. Otherwise, fantastic product that I've recommended to anyone considering a tablet for note-taking.