I recently worked with one of my customer who when clicking on the "Design" view of an ASPX page, the designer window doesn't appear - blank page appears. And if you minimize the VS window, and maximize it again - we will see the desktop background in the place of the Designer surface.

Verified that neither the "Microsoft Visual Studio Web Authoring Component" nor "Microsoft Web Designer tools" was installed on the machine (Control panel --> Add/Remove window components).

Ran the file [Path to the Installation DVD]\WCU\WebDesignerCore\WebDesignerCore.EXE

NOTE  :  This exe doesn't have a UI, so watch the Task Manager to know when this exe completes its installation.

Reference : http://forums.asp.net/t/1167590.aspx

Keywords : Visual Studio 2008 blank Design View hang