Controls cannot be created

[Josh Fink]

So I was doing the tutorials when I needed to reset my computer... afterwards I cannot get the controls to work on a page.  THe attached screenshot is all I get any help please?  I had to readd the controls manually to the toolbox and I tried reinstalling as well...  any help?

[Schlurk]

I believe if you go over this documentation article and remove and (re)add any Telerik assembly references to the GAC these issues should be taken care of.