title: Android studio 2.0 bug:no changes to deploy
body: <p>I download the latest Android Studio 2.0 from Android Develop Website.</p>
  
  <p>But when I change a line of code and use the "instant run", instead of updating the changes, it prompt me "<strong>no changes to deploy</strong>".</p>
  
  <p>This will happen on code changes and XML changes.</p>
  
  <p>But when I restart Android Studio, things will works fine for once or twice and then "<strong>no changes to deploy</strong>" Come again!</p>
  
  <p>I used my old SDK on Android Studio older version.
  JDK is 1.7.0
  Windows7 64</p>
  
  <p>So, is anyone has this same bug?</p>