title: getting plugin com.getdropbox.dropbox.garcon interrupted when open NSOpenPanel
body: <p>I'm getting this messages on the console when I open a NSOpenPanel and then my application crashes:</p>
  
  <pre><code>plugin com.getdropbox.dropbox.garcon interrupted
  plugin com.getdropbox.dropbox.garcon interrupted
  Unable to setup extension context - error: Couldn't communicate with a helper application
  </code></pre>
  
  <p>And in the debugger I get an warning on the Thread 6 saying this:</p>
  
  <pre><code>Queue: com.apple.NSXPCConnection.user.com.getdropbox.dropbox.garcon.apple-extension-service(serial)
      0_dispatch_barrier_async_f
  12 start_wqthread
  Enqueued from com.apple.NSXPCConnection.user.com.getdropbox.dropbox.garcon.apple-extension-service (Thread 6)
  0_dispatch_barrier_async_f
  </code></pre>
  
  <p>I tried everything openning my NSOpenPannel with <code>[openPanel runModal]</code> and <code>[openPanel beginSheetModalForWindow:...</code></p>
  
  <p>I use NSOpenPanel just to open a txt file</p>
  
  <p>What can I do to stop get this message and application stops crash?</p>
  
  <p>The App is not sandboxed and code signed. I just trying only in the Debug-build because I don't have an apple developer account. The Mac OS X version is 10.10 and the dropbox version is 3.0.3</p>