I have a strange issue to ask about. We have a product that contains packages, wizards, and UI components. We've run into an issue when performing the following steps: 1. Create a new ASP.NET website. 2. Switch to Design view in the open .aspx page. 3. Run a wizard of ours that adds a reference to an assembly (it contains our UI components) to the website. This wizard edits the web.config programmatically from a package, adding information to the controls, httpHandlers, and assemblies sections. 4. Drop one of our UI components in the designer. The UI component doesn't show up in the designer at all. If you refresh the view it shows an "Error Creating Control" box. What could be causing this behavior? It only happens if the Design view is open while we programmatically edit the web.config. If it's in Source view while editing the web.config and then you switch to Design view to drop the control, this doesn't happen. Thanks for any help you can offer.