title: Can't attach to Silverlight application with VS2010
body: <p>Few days ago all was ok: when I started my web-site with Silverlight 4.0 application with F5 in Visual Studio debugger was connecting to Silverlight automatically, but now it doesn't.</p>
  
  <p>I've tried to attach manually from "Debug"->"Attach to process" with "Attach to" option set into "Silverlight code" value. But my breakpoints are still "disabled"...</p>
  
  <p>Why? How can I resolve that? </p>
  
  <p>Thanks.</p>
  
  <p>P.S. I've created new Silverlight project recently - and is been able to attach to silverlight without any problems...</p>