I had a problem machine quilting one. The center piece was left loose and I kept catching it. I finally sewed it down with a decorative stitch. There was no sashing, so I just did a meander in the main part of the blocks letting the quilting continue from one block to the next. I did a loopy flower in the center block. I had problems with this area also because the block wasn't pressed really flat. You need to make sure your blocks are pressed as flat as possible, especially in that center intersection.