title: Why doesn't "heroku logs --app my-app" show my logs?
body: <p>When I type <code>heroku logs --app my-app-staging</code> I see the logs for my staging app.  When I type <code>heroku logs --app my-app-production</code>, I don't see anything.  But when I type <code>heroku logs -t --app my-app-production</code>, I'm able to tail my production logs with no issue.  Additionally, the log drain that I've set up is shipping no data.</p>
  
  <p>We're using these addons: Librato, Logentries, and FlyData.  I suspect that one of them may be blocking standard log gathering, but I can't figure out which one it might be.</p>
  
  <p>Has anybody else run in to this?  Ideas?</p>