I am developing my first Silverlight DV application.  I thought I would start simply with a grid, a splitter, and a dataselector.  I already had a datacube, so I followed the instructions on MS Technet to set up Http access to it.  Here is the code:

<UserControl x:Class="TestPivotGrid.MainPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d"
    d:DesignHeight="480" 
    d:DesignWidth="640" 
    xmlns:olap="http://schemas.infragistics.com/olap" 
    xmlns:sdk="http://schemas.microsoft.com/winfx/2006/xaml/presentation/sdk" 
    xmlns:xmla="clr-namespace:Infragistics.Olap.Xmla;assembly=InfragisticsSL4.Olap.Xmla.v11.1"
    xmlns:igPivot="clr-namespace:Infragistics.Controls.Grids;assembly=InfragisticsSL4.Controls.Grids.XamPivotGrid.v11.1" >
 
 
    <Grid x:Name="LayoutRoot" Background="White" DataContext="{Binding}">
        <Grid.ColumnDefinitions>
            <ColumnDefinition MinWidth="310" />
            <ColumnDefinition Width="Auto" />
            <ColumnDefinition MinWidth="300" Width="300" />
        </Grid.ColumnDefinitions>
        <Grid.Resources>
            <olap:XmlaDataSource 
                  x:Key="DataSource" 
                  ServerUri="http://imsds1/olap/msmdpump.dll"  >
                <olap:XmlaDataSource.Credentials>
                    <olap:XmlaNetworkCredential Password="xxxx" UserName="JSmith">
                    </olap:XmlaNetworkCredential>
                </olap:XmlaDataSource.Credentials>
            </olap:XmlaDataSource>
        </Grid.Resources>
        <igPivot:XamPivotGrid DataSource="{StaticResource DataSource}" DataContext="{Binding}" Grid.Column="0" HorizontalAlignment="Stretch" Margin="0" Name="XamPivotGrid1" VerticalAlignment="Stretch" />
        <sdk:GridSplitter Grid.Column="1" Grid.ColumnSpan="1" HorizontalAlignment="Center" Margin="0" Name="GridSplitter1" VerticalAlignment="Stretch" Width="4" HorizontalContentAlignment="Stretch" Background="DarkGray" />
        <igPivot:XamPivotDataSelector DataSource="{StaticResource DataSource}" DataContext="{Binding}" Grid.Column="2" HorizontalAlignment="Stretch" Margin="0" Name="XamPivotDataSelector1" VerticalAlignment="Stretch" />
    </Grid>
</UserControl>

In the ServerUri above, if I change "imsds1" to Sampledata.Infragistics.com", it works fine.  I can see the AdventureWorks DB in the dataselector.  If I change it back to "imsds1" I get nothing.  This would suggest that something is wrong with my Http setup.  However, it passes both tests given in the Technet article for testing your connection.  If I enter http://imsds1/olap/msmdpump.dll in IE, I get the following correct response:

- <soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">

In SSMS, if I select Connect to Analysis Services and enter http://imsds1/olap/msmdpump.dll, it connects just fine and shows the databases and cubes.

I thought perhaps it was an authentication problem, so I changed the access from Windows Authentication to Anonymous.  I also checked the permissions on the directories to make sure they are accessible to Everyone.

I saw some posts about problems with the grid in 10.3, so I upgraded to 11.1.  No change.

At this point I'm stumped.  Any suggestions?