Finally found something about both the Baby Lock Jazz and Jazz 2 at this URL
https://www.generations-quilt-patter...lock-jazz.html
Apparently both versions have a bad record for thread tension problems. In one response to the disappointed owner, another person wrote about how they pretty much solved the tension problem. I will be going over these suggestions carefully, and try to implement them. Maybe I can get this machine to actually be used for free motion quilting, instead of just straight stitching.
One of the remedies was to use the darning foot with the feed dogs up. I also noted that it seems the tension problems subside when using the feed dogs up..
What a strangely engineered machine. Maybe Baby Lock will fix the tension problems in their 3rd version, if they do come out with a Jazz 3.