title: Can't switch between windows phone emulators or devices
body: <p>I'm trying to port our existing windows phone 7.5 app to be available for our windows phone 8 users in Visual studio 2012. The app has been developed in Visual studio 2010, on a windows 7 machine. I have a new laptop set up with Windows 8 and visual studio 2012, on which everything works like a charm. I can create new projects, use the different emulators and test windows phone projects on my windows phone 8 test device.</p>
  
  <p>Once I open the windows phone 7.5 app solution in visual studio 2012, things go bad. I can only test the app on the "Emulator WVGA 512MB". When i try to change the emulator to a device, or even a different emulator, nothing happens. No errors, no exceptions. </p>
  
  <p>There's definitely something with my solution, but i can't figure out what. The project's properties and debug configuration seems to be exactly the same as on my windows 7 pc. The targeted OS Version is still windows phone OS 7.1. Can anyone with similar experience give me a pointer? I have no idea, even the eventlog can't help me out.</p>