The tension is set exactly as before, same quilt as before, same thread as before. I already quilted a bunch on this quilt. That's why I'm wondering why the change now. Maybe I need to take apart the bobbin case and clean inside, but I never have had to adjust any bobbin case screws.
I was using inferior thread in the bobbin when I was practicing FMQ so maybe it left a bunch of lint?
I'll try rethreading everything, already tried new needle.