I ran your forum page before I wrote the post.
SP will not run properly with a non-standard version of the jQuery library. This codex article explains what this means and what to look for:
http://codex.simple-press.com/codex/faq/troubleshooting/what-is-this-jquery-conflict/
This is not limited to SP by the way but will apply to ANY plugin that uses and relies on jQuery and the jQuery UI components and adheres strictly to the WP rules, protocols and API.
As stated, there may be other issues that may possibly be causing a problem but with the jQuery issue in place then that failure stops all other scripts from running correctly so diagnosis becomes impossible until the first issue is fixed.