Error en flujos de autorización (Evolution 1.11.0.2)

Compañeros, estoy en la version 1.11.0.2 y aparecen algunos flujos anulados, pero este error no se da con todos.

El log del wokflow lanza lo siguiente:

Aseinfo.Infrastructure.Base.Exceptions.AuthorizationWorkflowException: Sucedio un error en el flujo. Se está logueando el exception interno y luego se logueará el que terminará la instancia ---> System.InvalidOperationException: Collection was modified; enumeration operation may not execute.
at System.Collections.Generic.Dictionary`2.KeyCollection.Enumerator.MoveNext()
at Microsoft.Practices.Unity.UnityContainer.FillTypeRegistrationDictionary(IDictionary`2 typeRegistrations)
at Microsoft.Practices.Unity.UnityContainer.get_Registrations()
at Microsoft.Practices.Unity.UnityContainerExtensions.IsRegistered(IUnityContainer container, Type typeToCheck, String nameToCheck)
at Aseinfo.VH4.WorkflowServices.Global.BuildChildContainer(WorkflowContext context) in C:\vh4\VH4\WorkflowServices\WorkflowServices\Global.asax.cs:line 332
at Aseinfo.VH4.WorkflowServices.Services.AuthorizationWorkflowStaticService.EnviarRecordatorioActividad(Int32 codigoActividad, WorkflowContext context) in C:\vh4\VH4\WorkflowServices\WorkflowServices\Services\AuthorizationWorkflowStaticService.cs:line 135
--- End of inner exception stack trace ---
at System.Activities.Statements.MethodExecutor.InvokeAndUnwrapExceptions(Func`3 func, Object targetInstance, Object[] actualParameters)
at System.Activities.Statements.MethodResolver.SyncMethodExecutor.BeginMakeMethodCall(AsyncCodeActivityContext context, Object target, AsyncCallback callback, Object state)
at System.Activities.Statements.MethodExecutor.BeginExecuteMethod(AsyncCodeActivityContext context, AsyncCallback callback, Object state)
at System.Activities.AsyncCodeActivity.InternalExecute(ActivityInstance instance, ActivityExecutor executor, BookmarkManager bookmarkManager)
at System.Activities.Runtime.ActivityExecutor.ExecuteActivityWorkItem.ExecuteBody(ActivityExecutor executor, BookmarkManager bookmarkManager, Location resultLocation)