Solved! Go to Solution.
Do you have the same issue in the ArcMap document?
Malcolm,
What is the layer type that you are using when you add this to the Viewer?
Malcolm,
If you add it to your viewer as type feature each ArcGIS Server Map Service has a maximum number of records that it returns the 10.x default is 1000 records so this is liekly the situation you are running into. If you use type="dynamic" than you will not have that limitation.