Did you loosen the little wheel on the back of the machine (of course I've forgotten the name of the wheel) and also are you using the correct size bobbin? I had the same problem with the thread not winding around the bobbin and it turns out I was using the wrong bobbin! Once I got a new one out of the pack--no more problems! I have this problem all the time because some of my machines use the clear bobbins and they look sort of the same. I tried to mark them in permanent marker--different color for each machine but this one wasn't marked :x