Delegation issue within Domain Mapping?

I'm running a WordPress Multisite & BuddyPress installation with two primary sites:

- primary domain causeinternational.com
- subdomain australia.causeinternational.com which has a Domain Mapping to Addon Domain causeaustralia.com.au

The Domain Mapping entry is as follows:

Custom Domain Original Blog Address
http://causeaustralia.com.au/ http://australia.causeinternational.com/

When I go to access causeauatralia.com.au in either IE or Chrome I get a redirection to http://causeinternational.com/members/admin/classifieds/create-new/?.

I've cleared out my cache and have cleared out my browsing history ... but that doesn't change the result ... I still get delegated to http://causeinternational.com/members/admin/classifieds/create-new/?.

Any ideas on what's happening? (I do have the Classifieds plugin activated for australia.causeinternational.com but not for causeinternational.com ... if that has anything to do with it).

Any ideas?

Thanks as usual ... Michael