Ok, called the dealer and got a bit of help. I rewound bobbin & re threaded machine again and it seemed to do the trick. I could sew a nice straight line. Tried zigzag, miserable fail. It came out straight too! I have dealer stumped, so I guess I have to take it to dealer to fix. I hadn't even sewn 15 minutes on this thing. It better straighten up or I'm returning it!!!