I have 2 singer sewing machines and whenever the thread is breaking like that i find that I have to RE-THREAD the machine sometimes SEVERAL times until I can feel the thread give a little bit while its in there & not breaking! It's very frustrating but just keep rethreading from the beginning where you put the spool on your machine & sooner or later you'll get it right & it will work! GOOD LUCK!
I know you've said you have checked the tensions but that usually is the problem. When you pull on the top thread after it goes through the tension but before you thread it through the needle is there some tension but not so much that it breaks when you gently pull on it? It will be a bit harder to pull it at the point after it goes through the needle but it should have a bit of give there too without breaking.
Also check the bobbin again. Take it out of the machine and examine how the thread is wound around the bobbin. Is it all criss crossed or is it fairly evenly wound? Is it in the right direction and through the tension slot? Now dangle it by the thread while in the bobbin case. It should not just reel out to the floor but should slip a bit with some tension and hang there. A slight **** of the wrist should cause it to release a bit more thread and drop a bit more to the floor. It should allow slip but it shouldn't just reel out fast.
When you reinsert the bobbin case into the machine you should feel/hear a slight click as it catches into place.
Also check the needle though that usually isn't what causes this kind of problem.
The thread will break when it has no 'give'. Either the tensions aren't quite right or it is catching somewhere along the way through the various guides where you thread it. Oh and make sure the spool itself is freely turning on the spindle! Sometimes it is because of catching at that point and simply turning the spool upside down so it can't catch will solve the problem ! :)
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