itunes says computer unauthorized but it is authorized
after purchasing a song today from the Itunes store, it will not play on the Itunes program on the computer through which it was purchased; an error message says computer is not authorized. when I attempt to authorize the computer, I am told the computer is already authorized, which I knew...but somehow the song does not play....I unauthorized the computer, shut down, booted up, reauthorized and same pattern exists. please help- thanks