If you call the ChromiumWebBrowser.Dispose() method before calling Cef.Shutdown() the application will hang and is unable to shutdown. Removing the call to dispose fixes the issue.

This is observed on the latest 39.0.0-pre02 -pre release.

var browser = new ChromiumWebBrowser(); browser.Dispose(); Cef.Shutdown();

Ref: ChromiumWebBrowser.cs
Ref: Cef.h

There has to be some weirdness involved in relation to AddDisposable/RemoveDisposable.

/cc @amaitland