Comments Plus - Facebook API not working

Hi,
during the installation of Comments Plus I ran into some problems. I've managed to partially solve them, but there are some bugs remaining.
class_wdcp_public_pages L79 is hooking in the wrong action. "get_footer" is theme specific, I guess "wp_footer" would be the correct hook here (http://codex.wordpress.org/Function_Reference/wp_footer).
After fixing that I'm atleast able to login with my FB account. Unfortuneatly I cannot write any comments as WdCP_AdminPages::json_get_form returns the FB Login Button again. Some further investigation shows that the Facebook PHP API doesn't recognize that I'm logged in (returned Facebook User ID is 0).
I'm using Comments Plus 1.4 with Wordpress 3.3.1.
It would be great if anyone could help me.