Keep Defaults?? Code: Reconfigure Permissions in master database? (yes,no) [no]: Reconfigure Services? (yes,no,selected) [yes]: . . . Create new ISPConfig SSL certificate (yes,no) [no]: Reconfigure Crontab? (yes,no) [yes]:
And you are that you're logged in as the user "admin"? Nothing else comes to mind right now... If no one else thinks of something, you could consider hiring someone for remote support.
I don't think there is anything more to it, everything relevant which can be checked/changed that I know of has been mentioned. One thing not mentioned is in addition to /usr/local/ispconfig/interface/lib/config.inc.php you could have a config.inc.local.php that overrides the settings from config.inc.php, but as this was claimed to be tested with a fresh load of ISPConfig, that wouldn't apply.