Pro Site url no longer displays registration page

Hi, the Url used for users to register on my site is no longer working when pro sites plugin is enabled.

I also use buddypress to redirect to this url when clicking on the register link.

The error I get is as follows:
ERR_TOO_MANY_REDIRECTS
details
The web page at http://ljaweb.com/pro-site/?action=new_blog has resulted in too many redirects. Clearing your cookies for this site or allowing third-party cookies may fix the problem. If not, it is possibly a server configuration issue and not a problem with your computer.

When i disable the pro sites plugin the page loads as expected but without the pro site features.

Is there anything you can do to help me with this?
Thanks in advanced