title: Debugging a Visual Studio 2010 extension or addin, always gives me LoaderLock
body: <p>I'm trying to write an extension for VS2010, but I get this every time:</p>
  
  <ol>
  <li>Hit F5 to start debugging</li>
  <li>A new instance of visual studio starts up</li>
  <li>I can see a bunch of DLLs loading in the debug host while the new instance is starting</li>
  <li>It then fails with a "LoaderLock".</li>
  </ol>
  
  <p>When I continue after that, the new instance is fully functional, but there's no debugging happening at all.</p>
  
  <p>The same happens when creating an addin.</p>
  
  <p>Any clues?</p>