Plugin does not connect to facebook

The "facebook albums" widget states :"Please log in to your FB account first", when I try to select a Facebook album, although I am logged in. With the right account.

When I use the "Click here to do so now" link, I do not see a log-in page, but white page with just a zero in the top-left corner.

How do I make the album-widget connect to facebook?

(Facebook API settings are ok, according to the plugin's general settings page.)

Thank's in advance for your answer!

Greetings,

Fred and Appie