I don't have any other mods installed though... Well, I just downloaded Revolution, but it had the same problem. And I just replaced my CustomAssets folder with FfH's folder just in case. Nothing. Well, it did replace my name with the actual leader name for once.
Warning : File - ('Civ4Theme_Common.thm', Ln:378, Col:59) Could not load fontSylfaen, used fallback.
Warning : File - ('Civ4Theme_Common.thm', Ln:383, Col:59) Could not load fontSylfaen, used fallback.
Warning : File - ('Civ4Theme_Common.thm', Ln:384, Col:59) Could not load fontSylfaen, used fallback.
Warning : File - ('Civ4Theme_Common.thm', Ln:385, Col:59) Could not load fontSylfaen, used fallback.
Warning : File - ('Civ4Theme_Common.thm', Ln:388, Col:59) Could not load fontSylfaen, used fallback.
Warning : File - ('Civ4Theme_Common.thm', Ln:389, Col:59) Could not load fontSylfaen, used fallback.
Warning : File - ('Civ4Theme_Common.thm', Ln:393, Col:59) Could not load fontSylfaen, used fallback.
Warning : File - ('Civ4Theme_Common.thm', Ln:394, Col:59) Could not load fontSylfaen, used fallback.
Error : Decl - ('Civ4Theme_Common.thm', Ln:401, Col:13) Assignment source propertyId 'SF_CtrlTheme_Civ4_Control_Font_Size3_Italic' not found
Error : Decl - ('Civ4Theme_Common.thm', Ln:402, Col:13) Assignment source propertyId 'SF_CtrlTheme_Civ4_Control_Font_Size3_BoldItalic' not found
Error : Decl - ('Civ4Theme_Common.thm', Ln:408, Col:13) Assignment source propertyId 'SF_CtrlTheme_Civ4_Control_Font_Size1_Bold' not found
Error : Decl - ('Civ4Theme_Window.thm', Ln:3048, Col:9) Assignment source propertyId 'SF_CtrlTheme_Civ4_Control_Font_Size1_Bold' not found
sorry, but this is the error I got.