In my application I've a ContentPage and from there I'm able to open a MasterDetailPage, and I'm able to open this MasterDetailPage on a specific Detail page. This masterdetailpage is only initiated once and stored in a local variable.
The first time opening the MasterDetailPage (directly or not to a specific page) is working fine, but when I go back to my ContentPage before that and then selecting another Page to open directly in my MasterDetailPage it fails on setting the Detail page. When I open the same page on my 2nd attempt it doesn't fail.

It's behavior is different on iOS and Android.
iOS: It results in an exception
Android: The previous page is still opened. After going back again and selecting again the page I want to open it's showing my correct page.

App to reproduce the issue: https://github.com/App-Artment/xamarin-forms-tests

(small note: When the MasterDetail page is openend for the 2nd time, the menu button fails. I will create a new report for this)

Steps to reproduce on iOS:
- Open app
- 'Tap here to start'
- select: MasterDetail Navigation ->> Page 1
- Press START on navigationbar
- select: MasterDetail Navigation ->> Page 2 (<< This will result in the following exception)
Exception:
MonoTouch.Foundation.MonoTouchException: Objective-C exception thrown.  Name: UIViewControllerHierarchyInconsistency Reason: child view controller:<Xamarin_Forms_Platform_iOS_PageRenderer: 0x7c3290b0> should have parent view controller:<Xamarin_Forms_Platform_iOS_PhoneMasterDetailRenderer_ChildViewController: 0x7c328dd0> but actual parent is:<Xamarin_Forms_Platform_iOS_PhoneMasterDetailRenderer_ChildViewController: 0x7f3ee110>
  at at (wrapper managed-to-native) MonoTouch.ObjCRuntime.Messaging:void_objc_msgSend_IntPtr (intptr,intptr,intptr)
  at MonoTouch.UIKit.UIView.AddSubview (MonoTouch.UIKit.UIView view) [0x00021] in /Developer/MonoTouch/Source/monotouch/src/build/compat/UIKit/UIView.g.cs:613
  at Xamarin.Forms.Platform.iOS.PhoneMasterDetailRenderer.UpdateMasterDetailContainers () [0x00000] in <filename unknown>:0
  at Xamarin.Forms.Platform.iOS.PhoneMasterDetailRenderer.HandlePropertyChanged (System.Object sender, System.ComponentModel.PropertyChangedEventArgs e) [0x00000] in <filename unknown>:0
  at at (wrapper delegate-invoke) <Module>:invoke_void_object_PropertyChangedEventArgs (object,System.ComponentModel.PropertyChangedEventArgs)
  at Xamarin.Forms.BindableObject.OnPropertyChanged (System.String propertyName) [0x00000] in <filename unknown>:0
  at Xamarin.Forms.MasterDetailPage.set_Detail (Xamarin.Forms.Page value) [0x00000] in <filename unknown>:0
  at XamarinFormsTests.Views.MasterDetailNavigation.OpenPage (Int32 index) [0x00025] in /Users/tim/Projects/XamarinFormsTests/XamarinFormsTests/Views/MasterDetailNavigation.cs:85
  at XamarinFormsTests.Views.MainMenuPage+<InitPageContent>c__AnonStorey0.<>m__0 (System.Object sender, Xamarin.Forms.SelectedItemChangedEventArgs e) [0x00208] in /Users/tim/Projects/XamarinFormsTests/XamarinFormsTests/Views/MainMenuPage.cs:92
  at at (wrapper delegate-invoke) System.EventHandler`1<Xamarin.Forms.SelectedItemChangedEventArgs>:invoke_void_object_TEventArgs (object,Xamarin.Forms.SelectedItemChangedEventArgs)
  at at (wrapper delegate-invoke) System.EventHandler`1<Xamarin.Forms.SelectedItemChangedEventArgs>:invoke_void_object_TEventArgs (object,Xamarin.Forms.SelectedItemChangedEventArgs)
  at Xamarin.Forms.ListView.OnSelectedItemChanged (Xamarin.Forms.BindableObject bindable, System.Object oldValue, System.Object newValue) [0x00000] in <filename unknown>:0
  at Xamarin.Forms.BindableObject.SetValueActual (Xamarin.Forms.BindableProperty property, Xamarin.Forms.BindablePropertyContext context, System.Object value, Boolean currentlyApplying, SetValueFlags attributes, Boolean silent) [0x00000] in <filename unknown>:0
  at Xamarin.Forms.BindableObject.SetValueCore (Xamarin.Forms.BindableProperty property, System.Object value, SetValueFlags attributes, SetValuePrivateFlags privateAttributes) [0x00000] in <filename unknown>:0
  at Xamarin.Forms.BindableObject.SetValueCore (Xamarin.Forms.BindableProperty property, System.Object value, SetValueFlags attributes) [0x00000] in <filename unknown>:0
  at Xamarin.Forms.ListView.NotifyRowTapped (Int32 groupIndex, Int32 inGroupIndex) [0x00000] in <filename unknown>:0
  at Xamarin.Forms.Platform.iOS.ListViewRenderer+ListViewDataSource.RowSelected (MonoTouch.UIKit.UITableView tableView, MonoTouch.Foundation.NSIndexPath indexPath) [0x00000] in <filename unknown>:0
  at at (wrapper managed-to-native) MonoTouch.UIKit.UIApplication:UIApplicationMain (int,string[],intptr,intptr)
  at MonoTouch.UIKit.UIApplication.Main (System.String[] args, IntPtr principal, IntPtr delegate) [0x00005] in /Developer/MonoTouch/Source/monotouch/src/UIKit/UIApplication.cs:62
  at MonoTouch.UIKit.UIApplication.Main (System.String[] args, System.String principalClassName, System.String delegateClassName) [0x00038] in /Developer/MonoTouch/Source/monotouch/src/UIKit/UIApplication.cs:46
  at XamarinFormsTests.iOS.Application.Main (System.String[] args) [0x00008] in /Users/tim/Projects/XamarinFormsTests/iOS/Main.cs:17

Steps to reproduce on Android:
- Open app
- 'Tap here to start'
- select: MasterDetail Navigation ->> Page 1
- Press START on actionbar
- select: MasterDetail Navigation ->> Page 2 (<< Page 1 is still showed now)
- Press START on actionbar
- select: MasterDetail Navigation ->> Page 2 (<< Correct page is showed on 2nd attempt)


Version info:
Xamarin Forms: 1.3.0.6280-pre2

Xamarin Studio
Version 5.5.4 (build 15)
Runtime:
    Mono 3.10.0 ((detached/92c4884)
    GTK+ 2.24.23 (Raleigh theme)

    Package version: 310000031

Xamarin.Android
Version: 4.20.0.28 (Indie Edition)
Android SDK: /Users/tim/Library/Developer/Xamarin/android-sdk-mac_x86
    Supported Android versions:
        2.1    (API level 7)
        2.2    (API level 8)
        2.3    (API level 10)
        3.1    (API level 12)
        3.2    (API level 13)
        4.0    (API level 14)
        4.0.3  (API level 15)
        4.1    (API level 16)
        4.2    (API level 17)
        4.3    (API level 18)
        4.4    (API level 19)
        4.4.87 (API level 20)
        5.0    (API level 21)
Java SDK: /usr/
java version "1.6.0_65"
Java(TM) SE Runtime Environment (build 1.6.0_65-b14-466.1-11M4716)
Java HotSpot(TM) 64-Bit Server VM (build 20.65-b04-466.1, mixed mode)