title: Visual studio 2013 not loading references when opening a solution
body: <p>Ever since I installed Visual Studio 2013 Ultimate when I open a solution it appears that none of the external references are being loaded, ie the using statement will be shown in red saying that it cannot find the namespace. This will persist until I run a rebuild and then everything will be fine.</p>
  
  <p>I have tried resetting my environment settings to no avail, I would like to avoid reinstalling if at all possible.</p>
  
  <p>On the project I am currently working on this is happening with the System.Windows namespace, with the error 'Cannot resolve symbol 'Windows'.</p>
  
  <p>If it matters I have the following extensions:</p>
  
  <ul>
  <li>*AnkhSvn</li>
  <li>*AutoHistory</li>
  <li>Behaviors SDK (XAML)</li>
  <li>Microsoft Advertising pubCenter Service</li>
  <li>Microsoft Advertising SDK</li>
  <li>Microsoft Visual Studio ASP.NET MVC 5 Scaffolding</li>
  <li>Microsoft Web Developer Tools</li>
  <li>NuGet Package Manager</li>
  <li>*Productivity Power Tools 2013</li>
  <li>Visual F# 3.1</li>
  <li>Visual Studio Extensions For Windows Library</li>
  <li>Workflow Manager Activities</li>
  <li>*Xamarin Shell</li>
  <li>*Xamarin.Android</li>
  </ul>
  
  <p>Items marked with * are ones I installed myself and am using.</p>
  
  <p>So has anyone seen anything like this or is able to explain what is happening? </p>