I had this problem in a WPF application I was working on. When running the debugger, a process named MyApp.VsHost.exe would start and continue running in the background, but there would be no exceptions thrown and nothing in the Output window except build information.
It was because I had changed the namespace of my App
class but did not update the Class
attribute in App.xaml
to match the new namespace. I changed the namespace in the xaml file and it worked again.