原因：是由于系统采用server.mappath来读取api的配置文件，而如果论坛绑定到二级目录下，就读不到这个api配置文件了。

解决：打开ks_cls/clubfunction.asp

找到30行左右的代码

   Str=str & "<form method=""post"" autocomplete=""off"" id=""loginform"" action=""" & KS.GetDomain & "user/checkuserlogin.asp"">"

   If KS.ChkClng(KS.Setting(34))=1 Then Str=str & "<div class=""fastlg1"">" Else Str=str & "<div class=""fastlg"">"

   Dim  XslDoc:Set XslDoc = KS.InitialObject("Msxml2.FreeThreadedDOMDocument" & MsxmlVersion)

   If XslDoc.Load(server.MapPath("../api/api.config")) Then

      QQEnable=cbool(XslDoc.documentElement.selectSingleNode("rs:data/z:row").getAttribute("api_qqenable"))

   AlipayEnable=cbool(XslDoc.documentElement.selectSingleNode("rs:data/z:row").getAttribute("api_alipayenable"))

   If QQEnable Or AlipayEnable Then

     Str=Str & "<div class=""l"">"

  If QQEnable Then Str=Str & "<a target=""_blank"" href=""" & KS.GetDomain & "api/qq/redirect_to_login.asp""><img src=""" &KS.GetDomain & "api/qq/img/qq_login.png""/></a>"

  If AlipayEnable Then Str=Str & "<div style='margin-top:5px'><a target=""_blank"" href=""" & KS.GetDomain & "api/alipay/alipay_auth_authorize.asp""><img src=""" &KS.GetDomain & "api/alipay/alipay_button.gif""/></a></div>"

  If AlipayEnable=false Or QQEnable=false Then Str=Str & "<div style=""margin:3px"">只需一步，快速开始</div>"

  Str=Str & "</div>"

  End If

   End If

   Set XslDoc=Nothing

将上面的代码改成

   Str=str & "<form method=""post"" autocomplete=""off"" id=""loginform"" action=""" & KS.GetDomain & "user/checkuserlogin.asp"">"

   If KS.ChkClng(KS.Setting(34))=1 Then Str=str & "<div class=""fastlg1"">" Else Str=str & "<div class=""fastlg"">"

      Str=Str & "<div class=""l"">"

      Str=Str & "<a target=""_blank"" href=""" & KS.GetDomain & "api/qq/redirect_to_login.asp""><img src=""" &KS.GetDomain & "api/qq/img/qq_login.png""/></a>"

     Str=Str & "<div style='margin-top:5px'><a target=""_blank"" href=""" & KS.GetDomain & "api/alipay/alipay_auth_authorize.asp""><img src=""" &KS.GetDomain & "api/alipay/alipay_button.gif""/></a></div>"

     Str=Str & "<div style=""margin:3px"">只需一步，快速开始</div>"

    Str=Str & "</div>"