This is probably related to switching from JSF 1.1 to 1.2 - try asking on the JSF RI forum.
Thank you very much for your answer.
I'll ask there and post here the solution.
try this, use like first line in your xhtml
<?xml version="1.0" encoding="ISO-8859-1"?>
then you dont need
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
You can change the content type in the f:view tag, use this to resolve the problem: