I switched to embroidery thread and it's going much better. This is 3 layers of fleece, so I'm not using any stabilizer. I'm using a ball point needle. And I'm using my walking foot to feed all those layers through evenly. I've made this type of quilt a LOT in the last few years - I've never had this much trouble before! Guess it's time to take the old girl in for a real service.