Originally Posted by sewgarden
I get the same problem even when I've sprayed and pinned.
Heavily starching the backing (as opposed to spray starching) may help. I use a 1:1 solution of Sta-Flo and water, "painted" onto the fabric with a large wall painting brush until fabric is saturated, toss in dryer, then iron with steam. Backing fabric comes out *very* stiff and will not stretch while sewing.
It may be that your presser foot pressure is too high for your quilt sandwich.
What batting do you use? That could make a difference also.