I see your post is older, but I am having the same trouble with Nolting. Got mine in July at a quilt show, floor model, we were careful to set it up as instructed, called Nolting for help. I have been trying and trying to produce a good quilt. I switch bobbins and have to start all over. Tension, thread breakage - what did you do to resolve the problem. We are in Colorado - Nolting is in Iowa. It would be a long trip - but I'm ready to drive it back to them!