I have been experiencing a problem with the domain mapping plugin. After reading every relative post I could find I finally found the problem, I now conclude there may be a bug in the plugin. My problem was the external domain wasnt mapping to the domains of my multisite. I found the problem to be the database table wp_domain_mapping wasnt being populated. I copied wp_domain_map to wp_domain_mapping and now the mapping works.
I have mapped a second domain. The wp_domain_mapping table has been updated but the wp_domain_map table hasnt. The mapping works though.
So, should both these tables exist? Is this a bug? From my extensive reading on this issue it seems to have been around for some time. I am concerned that if this plugin gets updated it might mess up my setup.