We identified several issues with our new Upgrade Wizard shortly after our Q2 2011 release.
The following circumstances are known to cause issues when using the Upgrade Wizard:
- Having any invalid references in your project (marked with a warning sign in Visual Studio)
- Having COM references in your project
- Holding a project reference to a project which has not yet been built
- Holding a project reference to a project whose output assembly name differs from the project's name
All of the above issues have already been addressed and an update has been released through the Visual Studio Online Gallery:
Telerik Silverlight VSExtensions
You should be able to use the Visual Studio 2010 Extension Manager to download the update.
The Telerik Team