The log is huge, but I'm pretty sure this is the interesting part:
[UTC:28/02/13 18:47:34.508 Local:01/03 05:47] [Debug]: Workflow Run: 908 - AmazonEC2EndpointDataCollection - af86bffb-c71c-408d-bd32-5d3f2c9c754f
[UTC:28/02/13 18:47:34.944 Local:01/03 05:47] [Trace]: Worker Controller: WritePendingCompletions
[UTC:28/02/13 18:47:35.074 Local:01/03 05:47] [Trace]: AmazonWSModel: The AmazonCreateOrUpdateAccessKey activity started for AccessKey AmazonEC2
[UTC:28/02/13 18:47:35.122 Local:01/03 05:47] [Trace]: AmazonWSModel: The AmazonCreateOrUpdateAccessKey activity finished.
[UTC:28/02/13 18:47:35.126 Local:01/03 05:47] [Trace]: AmazonWSModel: The AmazonLogOn activity started with AccessKey AKIAJDRSU2G3ND6KX5MA
[UTC:28/02/13 18:47:35.224 Local:01/03 05:47] [Error]: Failed to run Amazon EC2 data collection. Error: Exception has been thrown by the target of an invocation.
[UTC:28/02/13 18:47:35.252 Local:01/03 05:47] [Trace]: Worker Controller: WorkflowApplication_Completed
[UTC:28/02/13 18:47:35.253 Local:01/03 05:47] [Trace]: Worker Controller: ProcessWorkflowCompleted
[UTC:28/02/13 18:47:35.253 Local:01/03 05:47] [Debug]: Workflow Complete: 908 - Failed: Exception has been thrown by the target of an invocation.
[UTC:28/02/13 18:47:35.253 Local:01/03 05:47] [Trace]: Worker Controller: WriteCompletedWorkflow
[UTC:28/02/13 18:47:35.254 Local:01/03 05:47] [Error]: <?xml version="1.0" encoding="utf-16"?>
<boolean>false</boolean>
Workflow "AmazonEC2EndpointDataCollection" failed with the following exception:
System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.FormatException: Unrecognized Guid format.
at System.Guid.GuidResult.SetFailure(ParseFailureKind failure, String failureMessageID, Object failureMessageFormatArgument, String failureArgumentName, Exception innerException)
at System.Guid.TryParseGuid(String g, GuidStyles flags, GuidResult& result)
at System.Guid..ctor(String g)
at lambda_method(Closure )
--- End of inner exception stack trace ---
at System.RuntimeMethodHandle._InvokeMethodFast(IRuntimeMethodInfo method, Object target, Object[] arguments, SignatureStruct& sig, MethodAttributes methodAttributes, RuntimeType typeOwner)
at System.RuntimeMethodHandle.InvokeMethodFast(IRuntimeMethodInfo method, Object target, Object[] arguments, Signature sig, MethodAttributes methodAttributes, RuntimeType typeOwner)
at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture, Boolean skipVisibilityChecks)
at System.Delegate.DynamicInvokeImpl(Object[] args)
at System.Data.Services.Client.Evaluator.SubtreeEvaluator.Evaluate(Expression e)
at System.Data.Services.Client.ALinqExpressionVisitor.VisitBinary(BinaryExpression b)
at System.Data.Services.Client.ALinqExpressionVisitor.Visit(Expression exp)
at System.Data.Services.Client.ALinqExpressionVisitor.VisitBinary(BinaryExpression b)
at System.Data.Services.Client.ALinqExpressionVisitor.Visit(Expression exp)
at System.Data.Services.Client.ALinqExpressionVisitor.VisitLambda(LambdaExpression lambda)
at System.Data.Services.Client.ALinqExpressionVisitor.Visit(Expression exp)
at System.Data.Services.Client.ALinqExpressionVisitor.VisitUnary(UnaryExpression u)
at System.Data.Services.Client.ALinqExpressionVisitor.Visit(Expression exp)
at System.Data.Services.Client.ALinqExpressionVisitor.VisitExpressionList(ReadOnlyCollection`1 original)
at System.Data.Services.Client.ALinqExpressionVisitor.VisitMethodCall(MethodCallExpression m)
at System.Data.Services.Client.ALinqExpressionVisitor.Visit(Expression exp)
at System.Data.Services.Client.ALinqExpressionVisitor.VisitExpressionList(ReadOnlyCollection`1 original)
at System.Data.Services.Client.ALinqExpressionVisitor.VisitMethodCall(MethodCallExpression m)
at System.Data.Services.Client.ALinqExpressionVisitor.Visit(Expression exp)
at System.Data.Services.Client.DataServiceQueryProvider.Translate(Expression e)
at System.Data.Services.Client.DataServiceQuery`1.Execute()
at System.Data.Services.Client.DataServiceQuery`1.GetEnumerator()
at System.Linq.Enumerable.FirstOrDefault[TSource](IEnumerable`1 source)
at System.Data.Services.Client.DataServiceQueryProvider.ReturnSingleton[TElement](Expression expression)
at System.Linq.Queryable.FirstOrDefault[TSource](IQueryable`1 source)
at DynamicOps.AmazonWSModel.Interface.AmazonEC2Services.AddProxyProperties(ManagementEndpoint endpointWithProxyProperties, ManagementModelEntities managementDataContext, Dictionary`2 properties)
at DynamicOps.AmazonWSModel.Activities.AmazonLogOn.Execute(CodeActivityContext context)
at System.Activities.CodeActivity.InternalExecute(ActivityInstance instance, ActivityExecutor executor, BookmarkManager bookmarkManager)
at System.Activities.Runtime.ActivityExecutor.ExecuteActivityWorkItem.ExecuteBody(ActivityExecutor executor, BookmarkManager bookmarkManager, Location resultLocation)
INNER EXCEPTION: System.FormatException: Unrecognized Guid format.
at System.Guid.GuidResult.SetFailure(ParseFailureKind failure, String failureMessageID, Object failureMessageFormatArgument, String failureArgumentName, Exception innerException)
at System.Guid.TryParseGuid(String g, GuidStyles flags, GuidResult& result)
at System.Guid..ctor(String g)
at lambda_method(Closure )