Ah.. you're using a RocketTheme template with the RokBooster plugin. We recently helped another user with a similar issue. Basically, the RokBooster plugin is changing the Facebook tags, like fb:login-button, fb:like, or fb:comments to just login-button, like, and comments. By stripping out the fb: from the tags, they no longer function. There's not anything we can do about it within JFBConnect as RokBooster is changing our code.
The user with issues posted in the RocketTheme forums, but it doesn't look to have been responded to. I'd recommend replying to that question that you're having a similar issue and hopefully you can get a response:
www.rockettheme.com/forum/index.php?f=62...18664&rb_v=viewtopic
Beyond that, my only suggestion is to disable the RokBooster plugin.
Hope that helps,
Alex