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    yes, i guess your upgraded website had in /language/yourlanguage/global.php
//%%%%% LANGUAGE SPECIFIC SETTINGS %%%%%
define('_CHARSET', 'ISO-8859-1');
By default, XOOPS 2.3 has now
//%%%%% LANGUAGE SPECIFIC SETTINGS %%%%%
define('_CHARSET', 'UTF-8');
you have to change it back to ISO.
Additionally, I guess you choose the "Do not change" option at the upgrade page "Database character set and collation"
let me know
    
          
        Do synergy or die.