Problem with html on windows

Hello

I have problem with html appearing on windows platform.

Im working on instagram authorisation and have code to display instagram auth window:

var urlReq:URLRequest = new URLRequest( OAUTHURL + "?client_id=" + _consumerKey + "&redirect_uri=" +  _callbackURL + "&response_type=token" + "&scope=" + _scope );

var rect:Rectangle = new Rectangle( 300, 300, 700, 500 );

_htmlLoader          = HTMLLoader.createRootWindow( true, null, true, rect );

_htmlLoader.addEventListener( Event.COMPLETE, accessCodeReceived );

_htmlLoader.load( urlReq );

it works awesome on MacOs but shows me blank window on Windows. Can anyone help me and advise?

macos:

windows: