Extension talk:Chat phpFreeChat

I have MW 1.11 and i've integrated phpfreechat on SpecialPage. But only thing I get is "Chat loading" window and nothing else. Someone could help? (As standalone PhpFreeChat works fine) Please!

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I have the same problem with MediaWiki 1.14.0 so would be grateful if anybody has any ideas! I'm looking into what is causing this, but I don't know much about php! Thanks.