You should not be able to pull the fabric along under the foot and over the feeddogs. It won't advance the fabric properly for sewing. Make sure the foot is pushed up all the way on the bar, and tighten the screw firmly. The feeddogs should be OK unless you loosened the screws holding them in.
Also you may need to adjust the pressure on the foot.
Last edited by jljack; 05-16-2012 at 12:23 PM.