This article explains the manual changes required when upgrading to Telerik Reporting Q3 2014 SP1 (220.127.116.114).
The viewer is build with Telerik UI Controls for WPF 2014.3.1202.40 (SP 1). If you are using a newer version consider adding binding redirects. For more information see: How to: Add report viewer to a WPF application
The viewer is build with Telerik UI Controls for Silverlight 2014.3.1202.1050 (SP 1).
TRDX files created by the Standalone Report Designer contain XML version http://schemas.telerik.com/reporting/2012/3.7