oauth Chrome Extension Google App Engine

[Jon via StackOverflow]

Had anyone had any luck getting OAuth between a Google Chrome extension and Google App engine to play nicely (or for that matter anything else?). I have followed all the steps.I have followed through the steps in this Google Dev tutorial and regardless I get redirected to about:blank at the end of the handshake process.

I have this code in my extension (cf what is in the tutorial):

var baseurl = 'https://my-app.appspot.com';
var oauth = ChromeExOAuth.initBackgroundPage({
    'request_url' : baseUrl + '/_ah/OAuthGetRequestToken',
    'authorize_url' : baseUrl + '/_ah/OAuthAuthorizeToken',
    'access_url' : baseUrl + '/_ah/OAuthGetAccessToken',
    'consumer_key' : 'anonymous',
    'consumer_secret' : 'anonymous',
    'scope' : baseUrl,
    'app_name' : 'MyApp'
});

...but I do not think this is the issue because I note a similar issue occurs when I use the tutorial's oAuth parameters - I get redirected to a page asking whether I want to grant access to Google Drive and on clicking 'grant access' I get sent to about:blank and there seems to be no OAuth token.

Any ideas much appreciated.

---

UPDATE Maybe I am ansering my own question - not sure. I was also working with the source for the ChromeToPhone extension - my code was based on this for the OAuth google app engine side of things. I tried installing this extension from source and got about:blank same issue. So then I went to this extension on the Extension App Store and the same thing occurs with that too. So maybe my Chrome (Version 31.0.1650.26 beta-m) is broken? Does this happen for anyone else or is my Chrome installation broken somehow?

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