The pdf content is not visualized properly on UWP and iOS when the file is loaded from a stream. 

Also if you try to load PDF twice on the same PDF Viewer, an exception is raised.

In Xamarin Forms.

When I call Calendar.ScrollAppointmentIntoView(theItem); in Android it works fine.

In iOS when the same call is made, the calendar scrolls about 1 pixel, then stops.

I put the call into a timer just to make sure it's there.

      Device.StartTimer(TimeSpan.FromMilliseconds(3000), () =>    

              { Device.BeginInvokeOnMainThread(() => {  Calendar.ScrollAppointmentIntoView(theItem); });             

                 return false; // True = Repeat again, False = Stop the timer    

      });

If customers set bindings to these properties and try to set range from negative to positive values (e.g. from -0.5 to 0.5) the bindings are not applied as expected.

When there is custom template applied that hosts multiple rows of UI components with total height greater than 44, the template is not measured correctly, leading to wrong visualization.

the following exceptions occur when upgrading to Xamarin.Forms v 4.0:

System.NotSupportedException: Unable to activate instance of type Telerik.XamarinForms.DataControlsRenderer.Android.ListView.TemplateCellContainer

System.NullReferenceException: Object reference not set to an instance of an object
  at Telerik.XamarinForms.InputRenderer.iOS.SegmentedControlRenderer.OnElementDetached

When trying to build the QSF example on GitHub, an error occurs due to The IHiearchyAdapter still being used in :

TreeView - First Look Example and Customizations Example.

The Error Message is Error CS0122: 'IHierarchyAdapter' is inaccessible due to its protection level (CS0122) (QSF)

Region.Op.REPLACE is deprecated and therefore the exception is thrown:

[AndroidRuntime] java.lang.IllegalArgumentException: Invalid Region.Op - only INTERSECT and DIFFERENCE are allowed
[AndroidRuntime] at android.graphics.Canvas.checkValidClipOp(Canvas.java:779)
[AndroidRuntime] at android.graphics.Canvas.clipRect(Canvas.java:826)
[AndroidRuntime] at com.telerik.widget.calendar.CalendarFragment.drawRows(CalendarFragment.java:589)
[AndroidRuntime] at com.telerik.widget.calendar.CalendarFragment.render(CalendarFragment.java:259)
[AndroidRuntime] at com.telerik.widget.calendar.CalendarScrollManager$FragmentHolder$LayerView.onDraw(CalendarScrollManager.java:136)
[AndroidRuntime] at android.view.View.draw(View.java:20207)