OAuth2 implicit grant (token flow) does not work in IE/.Net Winform WebBrowser

Hi Steve,

I want to report I'm seeing similar issue when running the WebBrowser control under Windows Vista. It is most probably a bug/incompatibility in the WebBrowser. My current suspicion is that the WebBrowser control have an issue handling a redirect url which includes fragment (#) in certain situations. My question to you is why Dropbox does the redirect with fragment and not the regular query (?) tag when doing the token flow? 

Here are the steps to reproduce the issue in my environment.

1. Using token flow authorization.

2. The application has already been authorized.

3. The WebBrowser control opens a page asking to enter credentials. Enter credentials and press 'Sign in'.

4. The WebBrowser Navigated event is called. However everything after the fragment (#) is removed.

Handling the DocumentCompleted or Navigating events is not working either.

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One more interesting observation. If I don't close the Desktop application and re-open the dialog containing the WebBrowser control, the Dropbox doesn't ask me for credentials and the token flow is called properly with the access_token fragment included.