those are multibyte chars (\xA5\xC3\xA1\xC3\xAD\xC3)
the error you are seeing is the result of multi-byte data characters attempting to be written with a non-multi-byte client character set connector.
Update to
at least UBB.threads version 7.7.2 (version 7.7.3 is current), where you can enable this from the control panel:
Control Panel > Paths & Database > Set Default Client Encoding to UTF8
OR, if for some reason you cannot update to the current version where your issue has been already addressed/fixed....
you can manually update your database to utf8mb4_general_ci collation, and modify the mysqli connector.
in /forums/libs/mysqli.inc.php
FIND:
if (!isset($config['PERSISTENT_DB_CONNECTION']) || !$config['PERSISTENT_DB_CONNECTION']) {
$this->dbh = mysqli_connect($config['DATABASE_SERVER'], $config['DATABASE_USER'], $config['DATABASE_PASSWORD'], $config['DATABASE_NAME']) or die("Problem occured in connection");
} else {
$this->dbh = mysqli_connect("p:" . $config['DATABASE_SERVER'], $config['DATABASE_USER'], $config['DATABASE_PASSWORD'], $config['DATABASE_NAME']) or die("Problem occured in connection");
}
INSERT BELOW IT:
mysqli_set_charset($this->dbh, "utf8mb4");
