Rachelle, it does not matter if I use a mat or not and no I do not use tables. When I first received the machine it cut just fine with or without a mat. Back then my problem was not knowing where the image was going to cut. Sometimes it would cut off the material and on to the mat no matter where I positioned the blade. Once I got that under control, this is now happening.
@Thyme, I am not sure what height the blade is set. I am still learning the machine. I have not adjusted anything. It was cutting fine before so I am not sure what happened. I made sure the blade was secure and debris free.