At a certain point in the movie, I want to show a movie clip in front of all
the stage. I put it there, and everything is all right. The only problem is
that when I hover my mouse above the point on the movie clip under which I have
a button, currently invisible, my mouse becomes a hand, indicating that somehow
the button is still not hidden in some ways. How can this be fixed?

Thanks a lot,

martas

How are you hiding your button, if you use the following the button should be both hidden and inactive

b1._visible=false

also try
b1.enabled = false;