Multi DB Help Needed Please

Can you please advise what I have done wrong with setup of Multi DB plugins for Wordpress MU. So happens this is the only plugin not on your support list so I selected the dashboard instead. But your instructions say you offer support for Multi DB.

I use MediaTemple Grid and create all 16 db's manually, then went in and assigned same username and pass to them. I followed your instructions to a "T" and seem to be getting the following error. Please advise

Warning: mysql_get_server_info() [function.mysql-get-server-info]: Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2) in /nfs/c10/h03/mnt/151144/domains/ on line 705
Warning: mysql_get_server_info() [function.mysql-get-server-info]: A link to the server could not be established in /nfs/c10/h03/mnt/151144/domains/ on line 705
Can’t select database
We were able to connect to the database server (which means your username and password is okay) but not able to select the db151144_gridwp_global database.
Are you sure it exists?
Does the user 1clk_wp_ngZhmOe have permission to use the db151144_gridwp_global database?
On some systems the name of your database is prefixed with your username, so it would be like username_db151144_gridwp_global. Could that be the problem?
If you don't know how to set up a database you should contact your host. If all else fails you may find help at the WordPress Support Forums.