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Hi,
Many thanks again for replying so promptly. I am not sure what you mean with HTTP_ACCEPT_CHARSET - is it HTTP_ACCEPT_LANGUAGE? If yes, it is en-gb,en;q=0.5.
I do not have greek as the main XOOPS language, but my settings in /languages/english/global.php are ISO-8859-7, el and 0 for mutli-bytes.
There is no XOOPS_DB_CHARSET, though, in mainfile.php, unless you are referring to something else.
You are absolutely right about the character set and collation variables.
Regards,
George