a darning foot should have the spring on it, also called a quilting foot or hopping foot. do you have it on correctly? ck your manual or ck with the place where you bought it or your machine. good luck.!
http://www.generations-quilt-pattern...ning-foot.html

Yes, check and see if you have it on correctly. I have done that before.

thank you all for your much needed advice it is greatly appreciated---and i did need another darning foot (wasn't the correct one for my machine)---problem solved !!!!!! thanx again!!!!!!