Could not load file or assembly 'Newtonsoft.Json

I have a couple of components in a workflow project that are custom from the Rest Generator.  The web service they communicate with returns a json formatted result.  I have three Rest components generated from the one integration library.

These (the workflow and the components) work well in debug but have problems once published.  I see exceptions as per the below.  Sometimes restarting workflow solves the problem but not always.

Has anyone seen this before?  The file C:\Program Files\Symantec\Workflow\Shared\lib\Newtonsoft.Json.dll is present and the workflows work just fine in debug.

System.Exception: Execution Engine Exception  ---> System.Exception: Execution Exception ---> System.Exception: exception component created:  ---> LogicBase.Framework.BusinessRuleException: The critical error failed execution on component [Name of my Component] : Could not load file or assembly 'Newtonsoft.Json, Version=6.0.0.0, Culture=neutral, PublicKeyToken=30ad4fe6b2a6aeed' or one of its dependencies. The system cannot find the file specified. :    at LogicBase.Core.Generators.Components.RestBaseComponent.ReadResponseJson(PathDefinition path, Stream stream)
    at LogicBase.Core.Generators.Components.RestBaseComponent.ReadResponseContent(IData data, PathDefinition path, Stream stream)
    at LogicBase.Core.Generators.Components.RestBaseComponent.Run(IData data)
    at LogicBase.Core.ExecutionEngine.MultiPathProcessComponentExecutionDelegate.Execute(IData data, IOrchestrationComponent comp, String& outputPath, IExecutionEngine engine, TLExecutionContext context)
    at LogicBase.Core.ExecutionEngine.AbstractExecutionEngine.RunComponent(TLExecutionContext context, IData data, IOrchestrationComponent comp)
    --- End of inner exception stack trace ---
    at LogicBase.Core.ExecutionEngine.ExceptionComponentDelegate.Execute(IData data, IOrchestrationComponent comp, String& outputPath, IExecutionEngine engine, TLExecutionContext context)
    --- End of inner exception stack trace ---
    at LogicBase.Core.ExecutionEngine.AbstractExecutionEngine.RunEngine(List`1 executionQueue)
    --- End of inner exception stack trace ---
    at LogicBase.Core.ExecutionEngine.AbstractExecutionEngine.RunEngine(List`1 executionQueue)
    at LogicBase.Core.ExecutionEngine.AbstractExecutionEngine.ExecuteComponent(IData data, IOrchestrationComponent component)
    at LogicBase.Core.Models.EmbeddedDecisionModel.EmbeddedDecisionModelExecutionEngine.Run(IData data)
    at LogicBase.Components.Default.Workflow.WaitOnExternalEvent.HandleEscalation(String taskID, String workflowID, IData data, Int32 level)

The only other thing I have noticed is a warning when I open this project of "Duplicate Class Loaded: Automation.RestBaseComponent" which auto-closes.

Workflow 7.6..4383.487