title: VS2010 - A project with that name is already opened in the solution
body: <p>The problem started after installing RiaServices Toolkit Dec 2010 (I guess).</p>
  
  <p>If I unload the project and reload it again, I get this message, even on an empty project (any type - no changes made to the project file).</p>
  
  <pre><code>Unloaded d:\users\carlucci\documents\visual studio 2010\Projects\ConsoleTestApp\ConsoleTestApp.Cmd\ConsoleTestApp.Cmd.csproj.
  
  Loading d:\users\carlucci\documents\visual studio 2010\Projects\ConsoleTestApp\ConsoleTestApp.Cmd\ConsoleTestApp.Cmd.csproj ...
  d:\users\carlucci\documents\visual studio 2010\Projects\ConsoleTestApp\ConsoleTestApp.Cmd\ConsoleTestApp.Cmd.csproj : error  : A project with that name is already opened in the solution.
  </code></pre>