title: Visual Studio hangs on build
body: <p>When I try to build my projects in Visual Studio 2008, web sites won't build anymore, they hang on this stage: </p>
  
  <pre><code>------ Build started: Project: C:\...\Web\, Configuration: Debug Any CPU ------
  Validating Web Site
  Building directory '/Web/Admin/Secure/'.
  Building directory '/Web/Admin/'.
  Building directory '/Web/Students/'.
  Building directory '/Web/'.
  
  Validation Complete
  </code></pre>
  
  <p>And I have to cancel it as it doesn't complete even after leaving it for an hour. Does anyone have any ideas on what's going on? Class libraries build fine.</p>