It works fine for me.
Chat is set properly and everything is echoed properly. Without braces, chat is set properly, but it does not echo properly.
You're sure there isn't something conflicting with it on your server?
PHP Code:
//#CLIENTSIDE
function onMouseDown() {
player.chat = "Test";
echo("onMouseDown()");
}
function GraalControl.onMouseDown() {
player.chat = "Super Test";
echo("GraalControl.onMouseDown()");
}