Thank You to everyone for your suggestions. I have tried them all. I first checked to see if I only had one blade in and then if I had put it together right. I changed to a different mat that I had just purchased. I losened the nut a little but for some reason as I use the cutter the nut works loose to almost falling off. I have to keep screwing it back on. Nothing seemed to remedy my situation. I did manage to get the squares blocked and I am now ready to continue sewing. Hopefully top will be finished tomorrow. I guess I am going to have to invest in another cutter when I can manage to save enough money to buy one. Thanks again