Ladies and gents...can we revisit this? I changed to polyester thread, was able to sew FMQ for 5 minutes then it wouldn't work anymore. Played with it for awhile, changing everything, rethreading, to no avail. I switched to straight stitch and it worked. Went back to putting feed dogs down and tried FMQ again. Nothing! I am ready to throw either myself or the machine out the window. Any advice or thoughts?