Change of network super user - WPMU Dev Dashboard

Hi, for securiy reasons, I changed my super user name, by creating a new user, allocating network superuser priviledges and deleting the old.

Unfortunately WPMU Dev dashboard no longer appears for the new network supeuser.

Disable, delete , re-install has no effect, so I am assuming that there is an option stored in the database that links to that user? An I right? What one should I delete via phpMyAdmin before re-installing the dashboard?