WP 351 BP 17 Domain Mapping died

Urgent

Upgraded to Wordpress 3.5.1 and Buddypress 1.7 (from 1.6.2) and now domain mapping does not work.

Normal sub domains work (after deleting the domain-mapping plugin folder).

Activating the domain mapping network wide without specifying a domain still works.

As soon as you try to map the domain from the user site it 'white screens'.

Any fix please?

Many thanks,

Johnny