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Seitdem (wahrscheinlich deswegen) ich mein Datenbankkennwort geändert hab, kommen auf jeder Seite im Forum

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Was kann ich dagegen tun? Das alte Kennwort machen hat nix gebracht.

Entferne aus der config.php sämtliche leere Zeilen/Zeichen, nach dem ?>. In deinem Fall sind die Leerzeichen in Zeile 43.
Siehe auch KB:headers_already_sent