Thats exactly what I was thinking...It's so easy to forget when you're using the darning foot. It can also be lint in the bobbin area or if your machine needs a little drop of oil in that area. Also be sure the bobbin thread is wound nice and tight, although you would probably see problems with straight stitch too. I have found that my Janome does require more top tension unless I'm using the blue dot bobbin case.
Originally Posted by
dmarie
That happens to me when I forget to lower the pressure foot. Easy to take out. Good luck.