title: The GNU screen is unresponsive, seems blocked
body: <p>GNU Screen seems to freeze. Unable to enter user input.  </p>
  
  <p>I was using GNU screen and when I pressed the screen it became unresponsive. I can execute all the GNU screen commands, but can't enter user input. I don't want to kill this screen as I have important work and I don't want to lose it.</p>