Domain mapping not mapping domains or allowing selection of primary domain

Hi there, the domain mapping plugin is now not working properly on my site.

I try to map another domain to this situation http://screencast.com/t/3OfECyVNdfV

And it just hangs.

And I notice that the little asterisk boxes are gone where you can select the primary domain. What's happening there, as my intention was to change the primary domain name of this site.

... And I still have two other open questions which have been open for a while. One of them relating to domain mapping plugin. If someone could help with this (and the other threads) that would be great.

Cheers, SAm