Originally Posted by
Tartan
Where is the broken off piece? Could it be interfering with the cutter?
This is exactly what I was thinking, and it makes me very nervous for you. It's possible that there's a tiny piece (or pieces!) stuck in that part (or even other parts!) of your machine. I'd definitely take it in and have it professionally serviced. You have several issues, first and foremost which is what happened to the bobbin case in the first place and why???