C# - PhpReference prolem

[samuelmpmac@codeplex]

I'm trying to use phalanger in an application in wich i need to use both php and c# pages. Everything works fine, but after i execute any page in .php with phalanger, when i try to run any c# page i receive an error saying that the type 'PHP.Core.PhpReference' can't be converted in 'MXM.Connection.AmbienteList'. It happens when i try to make this cast:

    protected void Page_Load(object sender, EventArgs e)
    {
        UsuarioPresenter UP = new UsuarioPresenter(((AmbienteList)Session[0]), this);
    }

From what i understood, phalanger must have converted Session[0] wich is originally of type 'object' to this 'PHP.Core.PhpReference' and is not converting it back... Is there any way to work this out?