Some things to troubleshoot:
Are your feed dogs up?
Is the quilt able to feed smoothly and not hung up on something, like the edge of the table? Sometimes the weight of the quilt will drag so it's impossible to for the foot to work.
Is the thread feeding smoothly and not hung up on the spool?
I will admit the only walking feet I've used are ones made for my machines (Viking and Bernina), so I've had no experience with generic feet. But as long as I have the foot installed correctly with the arm over the needlebar, they've worked well.
Janet