Would this be a javascript error?

I’ve been setting up wpmu for a company and can only load widgets like Google Friend Connect and the feedburner opt-in box on the main blog.

The opt-in box for feedburner only displays the links and not the box.

I’m sure it might be a plugin, but I have cross checked so many times and cant figure out which one would be causing this.

Any idea how to troubleshoot this?