I do not get loops but I have also had to fool around with my tension. It can even change each time I FMQ. I use 40wt King Tut and top stitch needle but I use 50 wt Masterpiece or So Fine or Bottom Line (60wt) for the bobbin. Try taking off the BSR and stitching without it. Is it still looping. Re thread, new needle, check bobbin, use new bobbin. Good luck.