After I panicked and posted here, my husband fiddled with the machine and I did not have the bobbin case quite in place. Working like a charm now. Since this was my first problem since getting the machine, I was getting very concerned that I would have to finish the quilt on my Pfaff.
I did not know that about using canned air on machines. Had no idea that things could rust. Will not do that again.
Thank you everyone,
Lynda