I was running fine with v2016.2.614.1. I upgraded today to 2016.2.708.1, and with that newer version, both my own application and your SDKBrowser example app generate the following error when they hit the TelerikForms.Init() line in AppDelegate.cs:
Exception has been thrown by the target of an invocation. - System.TypeInitializationException: The type initializer for Telerik.XamarinForms.DataControlsRenderer.iOS.ListView.ListViewLayoutAdapterBase 2 threw an exception. - System.MissingMethodException: Method CGSize..ctor not found.
I uninstalled the update and reinstalled the older version, and the error goes away.
The error occurred with Xamarin Forms 2.2.0.31, 2.2.0.45, and 2.3.0.107.