Electric oven: Bake and Broil not Working
First I am looking at your other post - thanks isherwood for linking , however you should have linked to it, to make it easier to read it..

You actually have a very similar issue and it could all be the same.

1: Did you check your range outlet for proper voltage. 
You should have 110V on both phases to Neutral and if so equipped to ground.

2: Your elements could be broken at the heating element connection. Generally there is a screw type connection with a nut. Sometimes they are also insulated with a compound at these connections / pass throughs. The possibility is they could be cracked or broken completely - WHEN you have the oven UNPLUGGED and off - give a slight tug on the wires attached see if anything is loosey goosey or wiggly.

What voltage do you measure across the elements in each mode ?