That was actually one of the things I had to do was remove the entry in phpmyadmin from the database...
For those who need to know you can find the entry in 'configuration_group > configuration_group_title
I just deleted the many entries for lightbox (loadza entries from trying so many times) and then entered it again so only had one using this statement...
SELECT @cgi := `configuration_group_id` FROM `configuration_group` WHERE `configuration_group_title` = 'Zen Lightbox';
(you may need to add your database prefix to 'configuration_group' so it looks something like 'zen_configuration_group'