bobbin tangling up

After sewing an inch or so, my item gets tangled in with the bobbin thread. I've rethread the bobbin, got my book out to make sure I'm threading it right but nothing has helped.

According to my beloved expert sat next to me, its a list of possibilities.

1.) Tension
2.) Is the presser foot fully down ? 
3.) Take the bobbin out and check that there are no stray threads in the bobbin case area.
4.) Is the top thread threaded properly, through ALL the guides ? 

Wow, she's deleted already. That was quick....