Can you check the values of the environment var LANG on both server systems? I suspect one is set to something like 'en_US.ISO8859-1' and the other is 'en_US.UTF-8'. (where en_US may be replaced with your local default language/charset)

Remember to check as the user running the web server. However, if your shell startup scripts don't mess with lang, they are probably the same for all users.

Setting LANG to 'C' or both to the same value will probably give consistent formatting. You can probably do that in mod_perl startup.pl or at the start of a standalone cgi app.

$ENV{'LANG'} = 'en_US.UTF-8';
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