Ultimate Facebook - the relogin not working in iframe

I am using the plugin for an iframe, actually the website is an iframe on Facebook. The plugin works like a charm. But... When I click log out, obviously, the login button appears instead of the avatar. And, if I click the button again, it's just not working. I cannot login again. If I try the button outside the iframe is working, but not inside the iframe. I have also tried with and without Auto-login, but I have the same problem. I really hope that someone can help make this work. Thank you!