I am machine quilting a wallhanging that is a window-pane design. It is divided into four squares. The squares are appliqued birds on tree limbs. I used an off white/shell colored fabric for the background. Sashing and borders are brown, red and multi colored "tail-feather" fabric. My quilt backing is dark brown. The birds are quilted, and I SID around the panels. Now I want to crosshatch each panel, using off white thread. My problem is that the bobbin thread shows on each stitch, making it look like polka dots. I have tried adjusting my thread tension one hundred ways to Sunday, but I can't seem to figure it out. I'd post pics, but sadly I don't even own a camera!! I'd appreciate any advice anyone can offer! I've learned so much reading and viewing everyone's work, I'm hoping it's a "well duh!!!" answer...as in I should have been able to figure this out myself!!! Thanks!!