Since Q3 we have introduced and additional step to setup the components - adding TelerikForms.Init() after Forms.Init(). More information can be found here - http://testdocs.telerik.com/devtools/xamarin/installation-and-deployment/important-changes
Also, currently, you need to reference AppCompat libraries version 220.127.116.11 rather than recently released v. 18.104.22.168 - http://docs.telerik.com/devtools/xamarin/installation-and-deployment/required-android-support-libraries.
You can check our SDK samples for the setup of the two point mentioned. It is located in C:\Program Files (x86)\Telerik\UI for Xamarin Q3 2015\Examples\XamarinForms of you installation.
In addition, we will issue build targeting this version as well as aligning the incorrect binaries version next week.
Please excuse us for the inconvenience caused!
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