In the following masterpage setup AJAX is working correctly but the LoadingPanel is not showing:
<telerik:RadAjaxLoadingPanel ID="RadAjaxLoadingPanel1" Skin="Default" runat="server" />
<telerik:RadAjaxManager EnableAJAX="true" ID="RadAjaxManager1" runat="server">
<AjaxSettings>
<telerik:AjaxSetting AjaxControlID="RecordOverview">
<UpdatedControls>
<telerik:AjaxUpdatedControl ControlID="RecordOverview" LoadingPanelID="RadAjaxLoadingPanel1"></telerik:AjaxUpdatedControl>
</UpdatedControls>
</telerik:AjaxSetting>
</AjaxSettings>
</telerik:RadAjaxManager>
<asp:contentplaceholder id="RecordOverview" runat="server"></asp:contentplaceholder>
Any clue?
Marc