LEARNED THE HARD WAY: if you have bias edges, STAY-STITCH them, but with your longest stitch, just like you learned to do in Home Ec working on wool or linen ... a simple pull here and there on that thread (here and there) will prevent that waffley business ... also be sure to tell your L/Aer that you have a bias border and ask her/his opinion on whether there is special handling ... if there is be prepared to either take it home and fix it ----or to pay for the extra work.