title: Python Stopped Working on Jupyter StartUp
body: <p>I start Jupyter from my powershell prompt <code>jupyter notebook</code> and it loads up correctly, but when I open a new or existing notebook, the kernel sits busy for about 10 sec and then I get a pop-up saying Python has stopped working. In my terminal I get <code>Invalid argument (C:\ci\zeromq_1602704446950\work\src\epoll.cpp:100)</code> (see below). Any solutions off the top of your head? I've tried using different environments and uninstalling/reinstalling <code>pyzmq</code>.</p>
  <pre><code>[I 12:58:16.682 NotebookApp] Serving notebooks from local directory: C:\Users\tobinp
  [I 12:58:16.682 NotebookApp] Jupyter Notebook 6.1.6 is running at:
  [I 12:58:16.684 NotebookApp] http://localhost:8888/?token=9eee2cc4e598b193ad42fc05ff620a43d0e5f29e885170b3
  [I 12:58:16.684 NotebookApp]  or http://127.0.0.1:8888/?token=9eee2cc4e598b193ad42fc05ff620a43d0e5f29e885170b3
  [I 12:58:16.685 NotebookApp] Use Control-C to stop this server and shut down all kernels (twice to skip confirmation).
  [C 12:58:18.289 NotebookApp]
  
  To access the notebook, open this file in a browser: file:///C:/Users/tobinp/AppData/Roaming/jupyter/runtime/nbserver-18144-open.html Or copy and paste one of these URLs: http://localhost:8888/?token=7xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx6 or http://127.0.0.1:8888/?token=7xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx6
  Invalid argument (C:\ci\zeromq_1602704446950\work\src\epoll.cpp:100)
  </code></pre>