title: Visual Studio loses ability to attach to Unity, why?
body: <p>I'm using Visual Studio with Unity. In general in VS I can simply click &quot;Attach to Unity&quot; and it will build the solution and indeed attach to Unity.</p>
  <p>Sometimes, however, a project loses the &quot;ability&quot; to do so, what means that suddenly clicking the button will only build the solution and not attach to Unity.</p>
  <p>I really would like to know what's happening there as I'm not aware of doing anything that could result in such a behaviour. <br>
  There are some parameters that might have an effect:</p>
  <ul>
  <li>it happens only for some  Unity projects: a project is either &quot;infected&quot; or it happens never (on my watch)</li>
  <li>if it starts happening it will always happen until I reboot the PC (closing VS and Unity is not enough)</li>
  </ul>