I can't get which issue are you facing however I have create new a simple demo.
Go To Shell.xaml in TelerikDocing directory
There are two options for with/without TelerikDocking in shell.xaml
A) Option 1- With-out Docking (currently working)
B) Option 2- With Docking. (If you want to set ,you have to un comment code segment B) and comment code segment A). )
Demo application working well with option A) Option 1- With-out Docking .
When you set option B) Option 2- With Docking.
Hope this will help to identify the issue.
Same for all the download in case if you unable to access:
Download : Telerik Docking Zip
-------- OR ----------------------------
Download : TelerikDocking2.zip
(This URL is valid until Friday, January 10, 2014
Note : Both the download files are same but in different location.
Let me know if you have any questions.