I was wondering if this ever has happened to anyone else. I was quilting a quilt and when I am sewing on light colored fabric the stitches are well defined and even, but when I would stitch across black or dark patterned fabric blocks, the stitch isn't as defined and almost looks like the thread is one line, then when I sew into a light colored patch the stitch becomes defined again. The back of the quilt shows very well defined stitches so I can't understand why the change in outward appearance. Has this ever happened to anyone else? It happens all the time, but I just thought to ask the group if anyone else has experienced it and what (if anything) I can do about it. Thanks in advance! Hope I am making sense.