Fleece is also one of my favorite backings for quilts. I have never had any problems with bunching up just with the way I quilt (ha,ha). I like to use my walking foot but lately it has been acting weird. I will be going along fine then for some reason my walking foot will jump up off the quilt and stay there. When I am able to get the foot back down I can go for a while then it will jump up again. I then continue with my regular foot and it works fine. Guess it's time for a new walking foot. BrendaK