Fb.ui() popup works but dialog loads forever

I want to ask a user to grant the "publish_stream" permission to my app with the facebook javascript sdk.

I initialize it like this:

FB.init({
    appId  : '203702512703',
    status : true, // check login status
    cookie : true, // enable cookies to allow the server to access the session
    xfbml  : true, // parse XFBML
    channelURL : 'http://mydomain.com/channel.php', // channel.html file
    oauth  : true // enable OAuth 2.0
});

And my FB.ui call looks like this:

FB.ui({
    client_id: '203702512703',
    method: 'oauth',
    scope: 'publish_stream',
    redirect_uri: 'http://mydomain.com/',
    response_type: 'token',
    display: 'dialog'
  });

If i change 'dialog' to 'popup' it works perfectly. But if i specify 'dialog' or leave the option out it shows me the fb-div but with a loading animation (like this: http://p.iqs.me/t1c4j ) and the content never loads.

What am i doing wrong?

UPDATE: I found this page http://developers.facebook.com/docs/reference/dialogs/#display that says the following about using "iframe" as display: "Because of the risk of clickjacking, this is only allowed for some certain dialogs, and requires you to pass a valid access_token"

Doesn't say anything like that about "dialog" thought but both iframe and dialog gives the same bad result.

How would i pass in the access_token?

'popup' is mandatory for method: 'oauth' or FB.login for javascript SDK because of security (clickjacking and phishing). I'd suggest to use FB.login anyway to get permissions or to authenticate because it is more convenient.

hope this helps