title: SonarQube Update Center shows nothing
body: <p>SonarQube 5.2 is up and running. Last week I installed a plugin from update center. Today, when I go to Update Center nothing is shown as available. Updates Only, Available, System Upgrade all tabs are showing <code>0 available</code>. I've tried restarting web server.</p>
  
  <p>Has anyone run into this?</p>
  
  <p>Environment: SonarQube 5.2 on Win7 with Embedded DB (still evaluating) running using <code>StartSonar.bat</code>.</p>
  
  <p><strong>Update</strong>
  Installed plug-ins are:</p>
  
  <p>C#</p>
  
  <p>Git</p>
  
  <p>Java</p>
  
  <p>JavaScript</p>
  
  <p>ReSharper</p>
  
  <p>SVN</p>