that sounds like there's still a problem with the bottom bobbin. When the needle goes into the fabric, it the thread from it should loop round the thread from the bottom bobbin and it sounds like that's not happening.
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Originally Posted by princesstigermouseThis most often happens if you pull the fabric too hard with the needle still in it - this pulls the needle across to the side and it hits the side of the metal plate on the base of the machine, instead of going through the hole in it.and the needle broke. I give up.
I wish I could see your machine 'in the flesh' - I might be more helpful if I could actually see what it was doing and look at it's set up.