The mentioned issues with the RadButton have already been fixed in 2013.1.227 internal build. It is possible that your have upgraded the dlls of your project with the dlls from the internal build, but your project is set to load them from the GAC which uses older dlls. You can watch this
videos related on how to check the location from which your project is loading the RadControl's dlls as well as how to check the version of RadControls on your current page.
Note also, that if you do not want to use the latest internal build, you can use the workaround for the mentioned issues from this
If you want, however, to downgrade your version of RadControls you can simply follow the steps in this
blog post. The blog post is about upgrading the version of RadControls but the approach for downgrading is the same.
the Telerik team
If you want to get updates on new releases, tips and tricks and sneak peeks at our product labs directly from the developers working on the RadControls for ASP.NET AJAX, subscribe to their blog feed