Property:MovieClip won't play

I’m making a memory game kind of thing, and everything works up through the onRelease handler. What’s not working is the flipping animation for the tiles. This is a simple movie.play() call from the Tile class (which has, as a property, a reference to the movie clip). I know the animation is correct. The particular chunk of code affected is here:

public function flip():Void {
c_movie.play();
c_revealed = !c_revealed;
}

C_movie is the class’s reference to the movie clip. Tracing the properties of “this” shows that it references the Tile object, as it should, and the operation on c_revealed works properly. I get no error messages or anything, but the tile just sits there. If I trace the value of c_movie, it displays the full path of the movie clip, so that seems to be correct, too.

I’m stumped. Full code is attached.

Rys