Well, after rethreading the bobbin & the needle several times, cleaning the bobbin case, changing the needle...I'm doing a happy dance! I took the advise of running thread (I did the dollar bill, too...just in case) and then started changing the tension dial a little bit at a time & Woo-hoo, I'm back in business! So, tomorrow I'm going to finish the first baby quilt & baste the quilt sandwich for the next one. Thank you to all who gave me great advice. I've fallen in love with this little green 15-125 for all my FMQ and didn't want anything bad to be happening to it. So, thank you, thank you thank you!