Today upgraded my (multi-)site from WP 3.4.1 to WP 3.5 and the domain mapping plugin from 3.0.something to 3.1.7 (latest version). I look in network admin settings and see that domain mapping created a new table in the db for the mapping.
It was prefix_domain_mapping and now is prefix_domain_map. I copied the content from the old in the new table and deleted the old table.
Wrong: all sites were redirected to the site-registration page.
When both tables are there, things go well.
But somehow I'm not convinced that this is how it should be.
Any advice is appreciated.