Shape Tweening ...

1st Rule : The object to be tweened needs to be on it's own layer

2nd Rule : The object must not be grouped or converted into a library symbol.
                If the object has a blue outline around it when selected, it needs to be broken apart in order to be
                tweened.

3rd Rule : If you want to use a shape tween to morph text, you will need to break apart the text twice.