title: SA_OAuthTwitterEngine login keyboard doesn't show after first launch
body: <p>I'm using the SA_OAuthTwitterEngine to integrate Twitter into on of my iPhone apps. Loggin in and sending tweets are working fine. But, when I completely terminate my app so it will start up from the beginning, I can't login again using the SA_OAuthTwitterController because the keyboard will not show up. The input field also doesn't respond to the Mac keyboard when using the simulator. </p>
  
  <p>I've searched for similar problems, but they don't help me out. I've found a lot of similar problems, where calling makeKeyAndVisible for the app delegate window solved it. This doesn't work for me. If I set the modalview's alpha to .2, I also don't see the keyboard behind the view controller. </p>
  
  <p>Weirdest thing is that everything works after a fresh reinstall for as many times as I want, but after I've terminated the app, the keyboard doesn't show op anymore. </p>
  
  <p>Can anyone point me in the right direction?</p>
  
  <p>Thanks in advance!</p>