The comments plugin requires an href parameter.

That's a little strange. For the Comment box, are you using the {JFBCComments} tag, or the Content plugin which inserts it into every article automatically?

As for the Login Button, can you send us a link to a page that works and one that doesn't? Usually, this is a javascript error on the non-working pages. We'll do what we can to get to the bottom of it.

Thanks!

You have something in the body tag of your site called "SetKeyword()". I don't know what this is, but it's supposed to be a Javascript function. That function is undefined, which is throwing a Javascript error.

There may be more problems, but this is the first thing that needs to be fixed. I have no clue what is adding the SetKeyword call though, so I can't help you there.

Good luck!