Change IP issues

I have a multisite install using domain mapping. I changed the IP to a dedicated IP for the site. Now non of the sub-sites are resolving. They are mapped to their own domains.

I have attempted to change the IP in the plugin, under Domain Mapping, but it will not change.

How do I get the sub-sites to resolve with the new IP?

http://wordpress.org/extend/plugins/wordpress-mu-domain-mapping/