I don't have the blue bobbin, but did have problems in the beginning with FMQ. Some of it was the thread I was using, some was tension, some was needle ... but a lot of it I am now convinced was user error. How do I know this? After changing thread/needle/tension and finally getting everything to work ... I now use pretty much whatever I want (thread wise) and may or may not change the needle, and may or may not need to change the tension and lo and behold ... everything works.