Facebook Login Handler doesn't get fired in Flex4 Facebook API

I have literally spent HOURS trying to solve this mystery... but simply can't seem to get hold of it.

I am using the same code lines (literally!) as the example here (official adobe tutorial) and I get different result.

protected function login():void
{
    Facebook.login(loginHandler,{perms:"user_birthday,read_stream,publish_strea开发者_如何学Gom"});
}

protected function loginHandler(success:Object,fail:Object):void
{
    trace ("login handler called");
    if(success){    
        currentState="state_home"; 
        Facebook.api("/me",getMeHandler);
        //userImg.source=Facebook.getImageUrl(success.uid,"small");
        Facebook.api("/me/statuses",getStatusHandler);
    } 
}

Everything works fine, i.e. everything till it is time to fire the loggedin event. I get asked to log in and all permissions are asked correctly. After I log myself in to facebook, the loggedin event doesn't fire. Is there any way of solving this problem??

And I am really desparate... :(

Have you tried debugging the JavaScript of the containing HTML page? I've found that the JavaScript can encounter errors in the communication back to your Flash movie, and it fails silently in the background.

Open the debugger and have a look for any errors - sometimes its down to conflicting embed object Ids in the HTML that throws it.