That sounds like a bobbin issue to me. Have you tried re-threading the entire machine? Just take it all out and start over. Sometimes when I'm having problems of unknown origin starting completely over is the only thing that fixes it. Make sure there's no fuzz caught in your bobbin works or in your feed dogs. How thick of a material are we talking? And when was the last time you changed your needle?
11/20/10 at 10:24am