title: Android Studio 3.4 waiting for application to come online
body: <p>Since upgrading to AS 3.4 I can no longer debug any of my apps. I have made no changes to any of the projects, I just upgraded AS. Now all I get is "Waiting for application to come online". </p>
  
  <p>When I click on Run->Attach Debugger To Android Process, there are no processes to attach.</p>
  
  <p>The apps load and run, but I cannot debug them.</p>
  
  <p>Is there anything I can do to get the debugger working?</p>
  
  <p>(I have tried clean, rebuild, invalidate cache and restart, make project and gradlew clean).</p>