SEO Facebook Comments and .handlediv bug – not collapsing

Hello there,

I have a problem with my WordPress. Metaboxes are not collapsing, just on the SEO Facebook Comments settings page. When I deactivate the plugin, WP functions well.

I tried to find at plugin source, but I couldn’t fond out why it’s ocurring.

Please, could you help me on that?

http://wordpress.org/extend/plugins/seo-facebook-comments/