title: Unable to debug with F5 from visual studio 2013, modules window is empty
body: <p>I am trying to debug a program using <em>start external program</em> in Visual Studio 2013. All project files are .NET 3.5. As a sidenote: I have debugged like this since i updated to VS2013 (about two weeks), but today it suddently stopped working.</p>
  
  <p>When I run the program it starts, but the <em>Debug->Windows->Modules</em> window is empty.</p>
  
  <p>When I start the program and attach Visual Studio to process with <strong>Managed (v3.5, v3.0, v2.0) code</strong> everything loads smoothly and I am able to debug.
  But when I choose <strong>Managed (v4.5, v4.0) code</strong> I get the same blank modules window as above and no active breakpoints.</p>
  
  <p>Could it be that <em>start external program</em> uses the <strong>Managed (v4.5, v4.0) code</strong> instead of <strong>Managed (v3.5, v3.0, v2.0) code</strong>?
  And is there any way to control which debugger Visual Studio uses when using <em>start external program</em>?</p>
  
  <p>I have double checked that all project that builds with the debug-configuration is set to .NET 3.5 since my first thought was that one of the projects might build in a higher version. One project is .NET4.0 but is not set to build in my configuration.</p>