Cannot comment on site as anonymous

Hi,

We have made a duplicate of one of our sites, this is the duplicate:
http://test.blog.aias.com.au/

Cannot get the comments to work for anonymous or admin users on the front end of the site. What I mean by that is that if I am admin I can only post comments via the administration interface (writing a comment in the comments section) but not on the fron-end of the website.

What is most bizzare is that the comments work fine on the original site but not on the duplicate site.

In the “Discussion” settings, “Users must be registered and logged in to comment” is tuned off but that still doesn’t explain why even admin users cannot post comments via the “Add comment” link on the front-end of the website.

How can I get the Comments to work for the duplicate site?
Is there any back-end configurations files that need changing after doing the deployment to the duplicate website?

thanks,
Andrei