title: Android emulator won't boot
body: <p>When trying to run an android emulator (either from eclipse or the cmd line) it simply starts an empty black box with the title 0: (obviously replacing  with the name of the avd!).  It never boots - doesn't even get to the boot animation.</p>
  
  <p>Logcat shows absolutely no output and devices shows it as emulator:5554 - offline</p>
  
  <p>This happens regardlessof which avd I start - and they had all previously worked.</p>
  
  <p>I'm running all this on linux.</p>
  
  <p>Edit: interestingly it also now fails to recognise an actual phone plugged in with debugging enabled... Android dev is now effectively impossible on this machine until I fix this...</p>
  
  <p>Edit #2: If I create a new emulator and/or edit an existing one (even if I don't actually change anything) enables it to boot.  This obviously enables me to move forward, but there is clearly still a problem with adb (actual devices still won't connect) which I still need to fix.</p>
  
  <p>Edit #3: Scratch that last edit - it seemed to work briefly, but not anymore...</p>