Turns out there is an issue with the language files on 6.3. It's supposed to be getting the charset from the generic.php language file - but upon closer inspection ubbt.inc.php isn'e using this information for the header.
Donate to UBBDev today to help aid in Operational, Server and Script Maintenance, and Development costs.
Please also see our parent organization VNC Web Services if you're in the need of a new UBB.threads Install or Upgrade, Site/Server Migrations, or Security and Coding Services.
