Omg, this is so annoying!
Figured out what my problem was! It had to do with the theme.
Somehow i feel you tried to integrate facebook comments a little too much into wordpress as it was part of the CMS and not as a separate plugin.
That reflects in certain conflicts. For example i’m the type of user who does not want to deal with wordpress comments. So i disabled them from the theme.
How is your plugin working with users who want to disable WP comments but leave Facebook comments up. You can do that by commenting the wp comments code in index.php, single.php and page.php but for those lacking those skills, how does it work?