I got the blasted thing fixed! It was simple, seems like the needle thread was getting caught in the looper thread when I threaded the looper. Once the needle thread was out of the way when I threaded the looper, it works fine. The machine, since it had been sitting for the past 4 years, not being used, is being serviced. Some of the knobs were hard to move, almost frozen in places& needed to be oiled. So it's at the serger " doctor" getting fixed. Nw I must remember to use it at least once a week instead of letting it sit for years.