World Base Map rendering problems on 1 machine

[DarrenRempel]

See the attached image.  ESRI runtime is unable to properly render the World Street Map.  We have only ever seen this happen on 2 machines - but once it happens - you can't fix it - is there a cache we can clear to reset it?  Any ideas on why this is occurring?  Has anyone else ever seen this?

We even tried a basic test app with the following code and the problem still occurs on this particular machine.

        <esri:Map>
            <esri:ArcGISTiledMapServiceLayer DisplayName="World Street Map"
                                                             Url="http://server.arcgisonline.com/ArcGIS/rest/services/World_Street_Map/MapServer"></esri:ArcGISTiledMapServiceLayer>
        </esri:Map>