We're using RadWindow very often and it worked good with Silverlight versions 2.0 and 3.0 Beta.
After installing Silverlight 3.0 official release we've used the Telerik assembly candidates for Silverlight 3.0
and this nasty bug with RadWindow appeared. It's moving really crazy and that issue is encountered by other users:
As I concluded the solution for this bug should come with Telerik SP1 at july the 15.-th,
but I can't figure out where is it at your site and how to download it, if there is a SP1 at all.
Could you please assist me with this?