I haven't tried the new bobbins yet, but she seems to be working fine now. My son (14) has been using her more than me and they seem to be getting along just fine!! I think it was the needle, because I haven't had a bit of trouble from her since I got her a new one. We actually used serging thread this weekend and she didn't seem to mind it a bit!!
Yes, I guess I posted my find on the wrong post... I'm a hand quilter and I was thrilled to find hand quilting thread so cheap!!