I just completed stitching the binding on to a quilt.  Changed to stitch in the ditch foot.  Folded the binding to the back of the quilt and need to stitch in the ditch to catch the back of the binding.  For whatever reason, my tension is completely off!  the top thread is pulling tightly bringing up loops to the front.  I've turned the S9 off and on, changed the thread and still the same.  This did not happen when I sewed the edge of the binding????  I didn't even turn the machine off in between.  Suggestions please!!!!