Problem with shape tweens basic

I am going for the effect of these graphics morphing into the enter button. you will see what i am trying to do if you dl the fla. its seems as if the shape tween i am going for ends up almost like a mask…very confused.

any help would be great…you will also see my other masking problem. i have done the masking many times…but i am scrwing up this one big time.