I'm sorry for the frustration, our aim is exactly the opposite. I can only point out that we list all the reasons for this problem we've been able to identify so far.
Anyways, the most important thing now is to fix the designer load on your side. Can you give me some more details on the project you get the error in? Does it use any special entries in the web.config? Do you run it in Medium Trust, or do you run it in Full trust? Do you run the Visual Studio IDE as an administrator?
Can you try creating a very basic website and add a RadControl to it? Can you verify that you have a Telerik.Web.Design
assembly in the GAC, which version matches the version of the Telerik.Web.UI
assembly, which has been copied to the website BIN?
I'm looking forward to your reply.
the Telerik team