I brooded about this all day and I am still puzzled. I had some issues earlier while trying to FMQ this quilt so I changed the needle (twice) adjusted the tension and tested on a scrap. The machine then worked just fine for more than 1/2 of the quilt. So last night when I started to finish it I sewed about 10" and flipped the quilt to see how it looked. It was fine so I went ahead and finished it off. Then when I flipped to the backing I found several areas full of loops. A bunch of loops then it would be fine...then more loops and more fine. What am I doing wrong?