[Roel]

Ok, enabled mysql debugger, add mysql_debug(1); in your ongamemodeinit, and restart the server, then run this script, and send us the last log lines that are inside the mysql_log.txt inside your server root.

Also you can try inserting a query with the phpmyadmin tool, if this also not works then your database structure is the cause.

edit; And you can show me your define of HouseLabel.