While rectangular sizes have different aspect ratios and need to be published separately if you use frames and such, all square sizes can be served in one single product/design. It would be useful if you would add a Square Only publishing option for that matter. Especially considering that the design gets completely messed up when switching from square to rectangular sizes and vice-versa (an issue I have addressed at the beginning and you have confirmed to be a known problem). P.S. This publishing option should be given on all products with different shapes (hor/vert/square). Thank you!