Ispconfig 2.2.24, CentOS 5.2, MySQL 5 Recently upgraded from 2.2.18 to 2.2.24. I restored my database with a backup pre-upgrade because we have many users with long usernames. The "Number of Databases" field is missing when I create a new site and enable MySQL.
ISPConfig 2.2.24 does not work with adatabase from a older version, the database forms have changed. You will have to do the update again and use the database from ispconfig 2.2.24, if you use some longer fields, you can adjust the field length in the sql dump which is in the ispconfig installer before you do the update.