RPC Mode set at ALL but only sender executes function

I was creating a simple chat script. Here is what it is:

if (GUILayout.Button ("Send") && chat != "") {
        networkView.RPC ("PrintText", RPCMode.All, chat, username);
        chat = "";
    }

Once the button is clicked it sends a message to call the PrintText funtion:

@RPC function PrintText (text : String, namez : String)
{
    log+= "<" + namez + "> " + text + "\n";
}

log here is a GUI Label.

But only the sender can see what he typed. He cannot see what others typed. Why so?