in the Connections/PowerCMSConnection.php file
change:
$PowerCMSConnection = mysql_pconnect($hostname_PowerCMSConnection, $username_PowerCMSConnection, $password_PowerCMSConnection) or trigger_error(mysql_error(),E_USER_ERROR);
to:
$PowerCMSConnection = mysql_connect($hostname_PowerCMSConnection, $username_PowerCMSConnection, $password_PowerCMSConnection) or trigger_error(mysql_error(),E_USER_ERROR);