i haven't tried daring with my 201 but have also noticed loops under the frabic especially when reversing. I brought it to my sewing machine repair man but in this instance he wasn't helpful. I have noticed when I use thread from the same spool for the upper and lower thread this seems to not happen as much where as my Singer 15 seems to be much move forgiving and I never have this problem. I too have endlessly fiddled around with the tensions but without fixing the problem.