title: Can't add new project to existing Solution
body: <p>I have a WinForms application. I see the solution file, but when I try to add new project to it and select the needed type of file, after pressing "OK" nothing happens, any ideas why?</p>
  
  <p>Visual Studio Professional 2017 15.4.0</p>
  
  <p><a href="https://i.stack.imgur.com/4Zp3J.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/4Zp3J.png" alt="enter image description here"></a></p>
  
  <p><strong>UPDATE:</strong>
  As it turned out I couldn't even create any empty project, so I had to reinstall visual studio cause I didn't find any other solution. All works fine now.</p>