Error Loading Map Services * * * * *

Hi guys, new here...  I've added a map service (MSD) and when I went to view it in the Viewer I get this message "Error Loading Map Services." Why didn't I get it in the Essential Manager wizard when I go through the wizard adding it?

I've already tried;

- clearing the cache in the AGS REST API Admin

- using another AGS/map service

- publishing the map service as a web app in AGS with success

- checked the map service in the ArcGIS Services Directory

- start/stop service

Have I missed something?

We use Geocortex Essentials 3.5.1 and ArcGIS 10

Thanks guys

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Rx