UpdatePanel / DataGrid / Internet Explorer Lock up

Hi!

I'm facing a strange problem and would like to know if anybody can help me out!
I've a page with 5 UpdatePanels which all use the same asynchronous Postback Trigger (a DropDown Box).

e.g.

<asp:ScriptManagerID="_scriptManager"runat="server"EnablePartialRendering="true">

<Services>

<asp:ServiceReferencePath="../services/positions.asmx"/>

</Services>

</asp:ScriptManager>

<asp:UpdatePanelID="UpdatePanel2"runat="server">

<ContentTemplate>

<asp:GridViewBorderWidth="0"CellSpacing="0"cellpadding="3"Width="100%"ID="grdCash"runat="server"ForeColor="#333333"GridLines="Horizontal"AutoGenerateColumns="False"ShowFooter="False">

<FooterStyleBackColor="#5D7B9D"Font-Bold="True"ForeColor="White"/>

<RowStyleBackColor="#F7F6F3"ForeColor="#333333"/>

<EditRowStyleBackColor="#999999"/>

<SelectedRowStyleBackColor="#E2DED6"Font-Bold="True"ForeColor="#333333"/>

<PagerStyleBackColor="#284775"ForeColor="White"HorizontalAlign="Center"/>

<HeaderStyleBackColor="#5D7B9D"Font-Bold="True"ForeColor="White"/>

<AlternatingRowStyleBackColor="White"ForeColor="#284775"/>

<Columns>

<asp:BoundFieldItemStyle-Width="80"DataField="SEGMENT"HeaderText="SEGMENT/CCY"HeaderStyle-HorizontalAlign="center"ItemStyle-HorizontalAlign="center"/>

<asp:BoundFieldDataField="DATUM"HeaderText="DATUM"HtmlEncode="False"DataFormatString="{0:dd.MM.yyyy}"HeaderStyle-HorizontalAlign="center"ItemStyle-HorizontalAlign="center"/>

<asp:BoundFieldDataField="FREE_CASH"HeaderText="FREE CASH"HtmlEncode="False"DataFormatString="{0:N}"HeaderStyle-HorizontalAlign="left"ItemStyle-HorizontalAlign="left"/>

<asp:BoundFieldDataField="SETT_TRANS"HeaderText="SETT.TRANS"HtmlEncode="False"DataFormatString="{0:N}"HeaderStyle-HorizontalAlign="right"ItemStyle-HorizontalAlign="right"/>

<asp:BoundFieldDataField="CPNS"HeaderText="CPNS"HtmlEncode="False"DataFormatString="{0:N}"HeaderStyle-HorizontalAlign="right"ItemStyle-HorizontalAlign="right"/>

<asp:BoundFieldDataField="REDEMPTIONS"HeaderText="REDEMPTIONS"HtmlEncode="False"DataFormatString="{0:N}"HeaderStyle-HorizontalAlign="right"ItemStyle-HorizontalAlign="right"/>

<asp:BoundFieldDataField="CASH_TRANSFERS"HeaderText="TRANSFERS"HtmlEncode="False"DataFormatString="{0:N}"HeaderStyle-HorizontalAlign="right"ItemStyle-HorizontalAlign="right"/>

<asp:BoundFieldDataField="DEPOSITS"HeaderText="DEPOSITS"HtmlEncode="False"DataFormatString="{0:N}"HeaderStyle-HorizontalAlign="right"ItemStyle-HorizontalAlign="right"/>

<asp:BoundFieldDataField="MAT_TD"HeaderText="MAT.TD"HtmlEncode="False"DataFormatString="{0:N}"HeaderStyle-HorizontalAlign="right"ItemStyle-HorizontalAlign="right"/>

<asp:TemplateFieldHeaderText="VALID"HeaderStyle-HorizontalAlign="center"ItemStyle-HorizontalAlign="center">

<ItemTemplate>

<asp:ImageID="imgValid"BorderStyle="None"runat="server"/>

</ItemTemplate>

</asp:TemplateField>

</Columns>

</asp:GridView>

</ContentTemplate>

<Triggers>

<asp:AsyncPostBackTriggerControlID="drpFonds"/>

</Triggers>

</asp:UpdatePanel>

The strange thing is that after a couple of refreshes (through the async postback trigger drpFonds) the Internet Explorer ( on the client ) locks-up and CPU utilization goes up to 100%.
I use some javascript code on this page, but there aren't any loops or timers (like setinterval etc.)
The partial postback executes some SQL queries and updates the datagrid(s) - nothing else happens.
I can't figure out what's wrong. Can anybody give me some hints on how to debug such a problem?

Thank you!

Regards
Holger

I had a problem just like that. It turned out that I was using a

Sys.WebForms.PageRequestManager.getInstance().add_endRequest(calledFunction)

without removing it using

Sys.WebForms.PageRequestManager.getInstance().remove_endRequest(calledFunction)

Every time the update panel posted back it added another delegate call to the event. So over time the target function was being called over and over and over until it crashed the browser.