I've got the same on my installation. Have you changed any ini settings from admin web-interface? If so please check all your *.ini.append.php files (with grep or whatever) if they contain charset declaration. For some unknown reasons my installation totally gave up when (which I've come to after few days) one of those ini files contained iso-8859-2 declaration (the one modified via web-interface). I've set this up manually to iso-8859-1 and it started working. I don't really know what happened but maybe that will help somebody. =)
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