Delegation issue within Domain Mapping?

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

- primary domain
- subdomain which has a Domain Mapping to Addon Domain

The Domain Mapping entry is as follows:

Custom Domain Original Blog Address

When I go to access in either IE or Chrome I get a redirection to

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

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

Any ideas?

Thanks as usual ... Michael