Chain stitch woes

Standard Rotary friends, please help! WHAT is going on with Jazzy? I really love her. She’s SUCH an amazing, powerful, precise and gorgeous machine. And yet, she gives me fits when I try to use her chain stitch attachment. One of the reasons I was so excited about her was the ability to do chain stitch embroidery, sans hefting around another machine head. :) What is going on here? Why is the thread tangling? What can I do to fix it? Very grateful for any and all suggestions. Thank you!