Having taken a class in FMQ (and failed miserably, I might add), I found out the hard way it is important to use quality thread. I was using my old stand-by---Coats and Clark. The thread continued to break constantly and the underside of my quilting attempts looked like yours much of the time Our teacher said better quality thread would not break because the fibers were longer. Coats and Clark uses short fibers so they can give us better prices.
And, my machine balked when I took her home and refused to sew. I found out my whole bobbin area was plugged up with short pieces of red thread that I had used in class.
Good Luck
I for one am becoming good friends with my long arm quilter for the time being
:mrgreen: :mrgreen: :mrgreen: