某个客户端提交不执行后台代码
用VS2003写的asp.net网站，前台有三个地方会调用后台代码，现碰到一台客户端在点击后，后台服务器不执行代码，类似没有提交到后台，全公司也就这一台客户端有此问题，客户端IE为6.0，初步怀疑客户端问题，但是这个怎么查啊，烦请大侠们帮忙，具体前后台代码如下：

前台调用的地方：
1、<asp:ButtonColumn HeaderText="考核状态" CommandName="confirm" HeaderStyle-Font-Names="helvetica,arial,sans serif" HeaderStyle-Font-Size="8pt" HeaderStyle-ForeColor="Blue"></asp:ButtonColumn>
2、<asp:checkbox id="ckAll" runat="server" AutoPostBack="True" Text="全选"></asp:checkbox>
3、<asp:imagebutton id="bt_confirm" runat="server" imageUrl="../Images/btn_batchconfirm.gif"> </asp:imagebutton>



后台对应代码
1、
  Private Sub DataGrid1_ItemCommand(ByVal source As Object, ByVal e As System.Web.UI.WebControls.DataGridCommandEventArgs) Handles DataGrid1.ItemCommand
  Dim tmpSQL As String
  Dim tmpComm As New CommonDB
  Dim tempDataset As DataSet

  If e.CommandName = "confirm" Then
  Dim tmpResult As Integer
  tmpSQL = "update exa_usertotal set STATUS='10',OP_NO='" & Session("UserID") & "',AppDate='" & Get_Date_YYYYMMDD(Now) & "',AppTime='" & Get_Date_HHMMSS(Now) & "' where StaffID ='" & DataGrid1.DataKeys(CInt(e.Item.ItemIndex)) & "' AND aplterm='" & Session("aplterm") & "'"
  tmpResult = tmpComm.ExecuteCmd_noCheck(tmpSQL)
  If tmpResult = 1 Then
  InsertExaData_to_HR_DB(DataGrid1.DataKeys(CInt(e.Item.ItemIndex)), Session("aplterm"))
  Response.Write("<Script language='JavaScript'>window.location.href=window.location.href;</script>")
  GenLog(Session("UserID"), "M000004", "为【" & DataGrid1.DataKeys(CInt(e.Item.ItemIndex)) & "】[" & Session("aplterm") & "]确认考核！", Page.Request.UserHostAddress)
  End If
  End If
  End Sub

2、
  Private Sub ckAll_CheckedChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ckAll.CheckedChanged
  Dim i As Integer
  Dim grdItem As DataGridItem
  Dim chkboxRow As System.Web.UI.WebControls.CheckBox
  Dim intSelectCount As Integer
  Dim intSelectIndex

  intSelectCount = 0
  For Each grdItem In Me.DataGrid1.Items
  chkboxRow = grdItem.FindControl("chkRow")
  chkboxRow.Checked = Me.ckAll.Checked
  Next

  End Sub

3、
  Private Sub bt_confirm_Click(ByVal sender As System.Object, ByVal e As System.Web.UI.ImageClickEventArgs) Handles bt_confirm.Click
  Dim i, Result As Integer
  Dim grdItem As DataGridItem
  Dim chkboxRow As System.Web.UI.WebControls.CheckBox
  Dim intSelectCount As Integer
  Dim tmpComm As New CommonFunction
  Dim tmpCommDB As New CommonDB
  Dim tmpSql As String
  Dim SQLArr(10000) As String
  Dim ArrNum As Integer = 0
  Dim intSelectIndex

  intSelectCount = 0
  For Each grdItem In Me.DataGrid1.Items
  chkboxRow = grdItem.FindControl("chkRow")
  If chkboxRow.