Ajax Loading Panel not showing on the page

[Rem]

We have a rather peculiar issue going on with the ajax loading panel.

First, the changes we did:

• We have upgraded from Telerik Q3 2010 to Q3 2011
• We have updated the solution from VS 2008 to VS 2010
• We have also updated the project to use the .Net Framework version 4.0 from 2.0
• The project is being published to a separate machine running on IIS 7 (previously was on IIS 6 on the same separate machine)
• We are using a 64 bit application pool with integrated mode (previously was 32 bit classic mode)

When we run the aspx site from within Visual Studio, it works fine and the loading panel shows up as expected.

However when we publish to the other machine, that's when it looks odd.  The loading panel doesn't show at all (although the processing of the aspx page still appears to work).  Checking with fiddler also shows that the loading panel doesn't work (nothing is sent/received).

We have the following code in the aspx page:

<telerik:RadAjaxManager id="RadAjaxManager1" runat="server">
            <AjaxSettings>
                <telerik:AjaxSetting AjaxControlID="btnValidate">
                             <UpdatedControls>
                                   <telerik:AjaxUpdatedControl ControlID="divAll" LoadingPanelID="RadAjaxLoadingPanel1"></telerik:AjaxUpdatedControl>
                               </UpdatedControls>
                </telerik:AjaxSetting>
           </AjaxSettings>
</telerik:RadAjaxManager>


<telerik:radAjaxLoadingPanel ID="RadAjaxLoadingPanel1" runat="server" mindisplay="5000" ZIndex="10000">
     <asp:Image ID="Image2" runat="server" ImageUrl="../images/Loading3.gif" alt="loading..."  />
</telerik:radAjaxLoadingPanel>

We are not sure what else we might be missing?

[Maria Ilieva]

Hi Rem,

Could you please ensure that the dll version of the both machines you are testing the project are the same? Also please try the application by simply set Skin for the LoadingPanel and not implement an image like this:

<telerik:RadAjaxLoadingPanel ID="RadAjaxLoadingPanel1" runat="server" Skin="Default"></telerik:RadAjaxLoadingPanel>

Kind regards,
Maria Ilieva
the Telerik team

[Rem]

Hi Maria,

The dll version is the same on both machines.

We have also tried to use the default skin as you suggested, but unfortunately it has not resolved the issue.

[Maria Ilieva]

Hi Rem,

Another possible approach would be to show/hide the RadAjaxLoadingPanel explicitly as describe din the help topic below:
http://www.telerik.com/help/aspnet-ajax/ajax-show-hide-loadingpanel.html
Give this a try and let me know if it helps.

Kind regards,
Maria Ilieva
the Telerik team