I have an ArcSDE server serving some poly layers through a map service running on ArcGIS Server 10.0. The service appears to be working--I can navigate to it just fine in the REST view and I can see the data when I do the View In ArcGIS JavaScript option.
However when I load up ArcMap and attempt to add the service to a layer it appears to succeed but does not show up; the screen remains white no matter what extent I'm viewing. The layer is set to be viewable at all extents and appears to be the correct spatial reference so I'm a bit confused why the javascript viewer can see it but not ArcMap.
edit I should add that I have a Silverlight app pointing at the service as well and that also does not show the data.