I like to use the dual-feed pretty much all the time when I sew. It just sews so nice with it engaged! But, lately it has been giving me problems. It hangs up on seams really bad, and now I cannot use it at all for piecing quilts :(
This is where is hangs up. Every time.
Presser foot UP, and you can see it has caught on the seam:
I think maybe the tip of it where the 'teeth' are has just worn down. I sew a LOT! Quilting is less than half my sewing.