Originally Posted by hazeljane
Mine did this when I first got it. I went crazy. I did loosen the bobbin tension a quarter turn, and that helped. Then I took all the plates off and cleaned thoroughly, and oiled. Just before I got my machine, someone told me to remember three words: "Juki Loves Oil" and she really does. I got mine going again, and have not had the problem since.
Also, when I am FMQ, I set the stitch length to 0, because that's what the directions told me and I have not had any problems.
I agree with this and on the yahoo Juki group it was mentioned that the bobbin could be spinning when doing curves which causes the loops? When you think of how fast this machine goes it makes sense.