Architectural Survey Line layer failed to load: Fault code: Channel.Security.Error
Fault info: Security error accessing url
Fault details: Destination: DefaultHTTP
Research suggests I should be using Crossdomain.xml, which I've copied to just about every single folder there is, same problem.
When using http://[FQDN]/arcgis/rest/services/CRGIS_EDIT/ to define the operational layer in the Flexviewer builder, using the ArcGIS admin account or my windows account will allow access to the service.