Eddie, I assume you have the showrelatedrecords tag set to true in the AttribruteTableWidget.xmlDocs: http://resources.arcgis.com/en/help/flex-viewer/concepts/index.html#/Attribute_Table_widget_tags/01m30000004t000000/
Eddie, Is the related table secured?
Eddie, It sound like it could be related to this bug:http://forums.arcgis.com/threads/86603-Token-does-not-work-on-my-related-table-in-my-dynamic-service-requires-me-to-log-in.?p=306477&viewfull=1#post306477I would give tech support a call on this issue though.
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