Sample reproduction of MTMBProgressHUD issue with iOS 6

AppDelegate.cs

using System;
using System.Linq;
using System.Collections.Generic;

using Foundation;
using UIKit;
using CoreGraphics;
using MBProgressHUD;

namespace HudCrashSample {
    public class HudCrashViewController : UIViewController {
        UITextView someView;
        public override void ViewDidLoad() {
            base.ViewDidLoad();

            someView = new UITextView() {
                BackgroundColor = UIColor.LightGray,
                Text = "This is a test UITextField",
            };
            someView.Frame = new CGRect(new CGPoint(6f, 6f), new CGSize(View.Bounds.Width - 12f, 50f));
            Add(someView);

            var hud = new MTMBProgressHUD(View) {
                LabelText = "Waiting...",
                RemoveFromSuperViewOnHide = true
            };

            View.AddSubview(hud);

            hud.Show(animated: true);
            hud.Hide(animated: true, delay: 5);
        }
    }

    [Register("AppDelegate")]
    public partial class AppDelegate : UIApplicationDelegate {
        public override UIWindow Window { get; set; }
        UIViewController rootController;
        public override bool FinishedLaunching(UIApplication app, NSDictionary options) {
            rootController = new HudCrashViewController();
            Window = new UIWindow(UIScreen.MainScreen.Bounds);
            Window.RootViewController = rootController;
            Window.MakeKeyAndVisible();
            return true;
        }

        // This method is invoked when the application is about to move from active to inactive state.
        // OpenGL applications should use this method to pause.
        public override void OnResignActivation(UIApplication application) {
        }
        // This method should be used to release shared resources and it should store the application state.
        // If your application supports background exection this method is called instead of WillTerminate
        // when the user quits.
        public override void DidEnterBackground(UIApplication application) {
        }
        // This method is called as part of the transiton from background to active state.
        public override void WillEnterForeground(UIApplication application) {
        }
        // This method is called when the application is about to terminate. Save data, if needed.
        public override void WillTerminate(UIApplication application) {
        }
    }

    public class Application {
        static void Main(string[] args) {
            AppDomain.CurrentDomain.UnhandledException += OnUnhandledException;

            try {
                UIApplication.Main(args, null, "AppDelegate");
            }
            catch (Exception ex) {
                HandleException(ex);
            }
        }
        static void OnUnhandledException(object sender, UnhandledExceptionEventArgs e) {
            HandleException(e.ExceptionObject as Exception);
        }
        static void HandleException(Exception exception) {
            Console.WriteLine("Top-level exception: {0}", exception);
        }
    }
}