Sounds like the feed dogs aren't lined up for the 1/4" seam--probably factory set for 5/8" for garments. Try adjusting the needle to your left. You'll have to adjust your seam allowance or seam quide to make up for it but my old mechanical does this also so I always have to remember to reposition the needle so that the feed dogs will grab properly. This is where the accufeed, pin feed, extra feed dogs and/or IDT on the expensive sewing machines really pays off.