Android : MvvmCross - Clear Task / New Task - Android

I'm developing an Android application using MvvmCross and I'm having some problems with ActivityFlags.NewTask and ActivityFlags.ClearTask.

I have 2 Activities one to login and another to show some data to the logged user. The problem is that when I start the new Activity sending the Flags NewTask and ClearTask it seems to work, pressing back closes the application (without passing through the login activity), but when i reopen it, it shows the login activity. If I kill the app and reopen it, it opens in the correct Activty (the second one). Anyone have any idea why this is happening?

My App.cs initialization:

if (SharedSettings.AppSettings.GetValue(SharedSettings.Keys.IsLoggedIn.ToString(), false))
{
    RegisterAppStart<ViewModels.DataViewModel>();
}
else
{
    RegisterAppStart<ViewModels.LoginViewModel>();
}

My ViewPresenter using a CustomHint:

public override void ChangePresentation (MvxPresentationHint hint)
{
    if (hint is MvxRootPresentationHint)
    {
        var rootHint = hint as MvxRootPresentationHint;
        var requestTranslator = Mvx.Resolve<IMvxAndroidViewModelRequestTranslator> ();
        var newRootIntent = requestTranslator.GetIntentFor (new MvxViewModelRequest (rootHint.NewRootType, null, null, null));

        newRootIntent.AddFlags(Android.Content.ActivityFlags.NewTask);
        newRootIntent.AddFlags(Android.Content.ActivityFlags.ClearTask);
        Activity.StartActivity (newRootIntent);
    }
    else
    {
        base.ChangePresentation (hint);
    }
}

Resumed step by step sequence:

• Open application - opens login activity


• Do the login operation - opens the data activity


• Press the back button - closes the application


• Reopen the application - opens in login activity


• Teminate the application - closes the application


• Reopen the application - opens in data activity