I have two 12 1/2 inch Omnigrip squares. I was squaring up a block and when I turned it, it still wasn't square. So I put the two rulers together and guess what. One of them is not square. I have written to Prym, but to date have not heard from them. I'm not sure JoAnn's would take it back as I had the unsquare one a while, I just wasn't using it, just carrying it around in my bag that I take to classes, etc. Anyone else had this problem?