FXCOP lancia un'eccezione sulla riga di comando, ma non nella GUI?

Question

Ho un progetto FXCOP 10.0 che funziona bene tramite la GUI FXCOP ma quando lo eseguo attraverso l'app di riga di comando FXCOPCMD (che voglio utilizzare come parte del nostro processo di build automatizzato) genera la seguente eccezione, apparentemente mentre provo a caricare Assemblee.

  <Exception Keyword="CA0001" Kind="Engine">
   <Type>System.InvalidOperationException</Type>
   <ExceptionMessage>Collection was modified; enumeration operation may not execute </ExceptionMessage>
   <StackTrace>   at System.ThrowHelper.ThrowInvalidOperationException(ExceptionResource resource)
   at System.Collections.Generic.List`1.Enumerator.MoveNextRare()
   at System.Collections.Generic.List`1.Enumerator.MoveNext()
   at Microsoft.FxCop.Sdk.WeakAssemblyReference.FindMatchingReference(WeakAssemblyReference faRef, AssemblyReferenceCollection references, Hashtable cache)
   at Microsoft.FxCop.Sdk.WeakAssemblyReference.Initialize()
   at Microsoft.FxCop.Sdk.FrameworkAssemblies.GetFrameworkAssemblyReference(WeakAssemblyReference&amp; assemblyRef, String assemblyName)
   at Microsoft.FxCop.Sdk.FrameworkAssemblies.get_SystemCore()
   at Microsoft.FxCop.Sdk.FrameworkTypes.get_DynamicAttribute()
   at Microsoft.FxCop.Sdk.INodeWrappers.CCIParameterWrapper.get_DynamicTypes()
   at Microsoft.FxCop.Sdk.INodeWrappers.CCIParameterWrapper.get_Type()
   at Microsoft.FxCop.Sdk.NameProviders.NameProvider.WriteCommaSeparatedParameters(INodeCollection`1 parameters)
   at Microsoft.FxCop.Sdk.NameProviders.NameProvider.WriteMethodParameters(IMethodNode method)
   at Microsoft.FxCop.Sdk.NameProviders.NameProvider.WriteMethod(IMethodNode method)
   at Microsoft.FxCop.Sdk.NameProviders.CodeWriter.WriteCore(INode node)
   at Microsoft.FxCop.Sdk.NameProviders.NameProvider.WriteCore(INode node)
   at Microsoft.FxCop.Sdk.NameProviders.NameProvider.GetName(INode node)
   at Microsoft.FxCop.Engines.Introspection.Persistence.GetName(Node node, NameStyle style)
   at Microsoft.FxCop.Engines.Introspection.BaseVisitor.FindTargetMember(Member member, TargetMemberDictionary targets)
   at Microsoft.FxCop.Engines.Introspection.LoadVisitor.FindTargetMember(Member member, TargetMemberDictionary targets)
   at Microsoft.FxCop.Engines.Introspection.BaseVisitor.VisitMembers(MemberCollection members, TargetMemberDictionary targets, Boolean visitNestedTypes)
   at Microsoft.FxCop.Engines.Introspection.BaseVisitor.VisitType(TypeNode type, TargetType target)
   at Microsoft.FxCop.Engines.Introspection.LoadVisitor.VisitType(TypeNode type, TargetType target)
   at Microsoft.FxCop.Engines.Introspection.BaseVisitor.VisitTypes(TypeNodeCollection types, TargetNamespaceDictionary targets)
   at Microsoft.FxCop.Engines.Introspection.LoadVisitor.VisitModule(ModuleNode module, TargetModule target)
   at Microsoft.FxCop.Engines.Introspection.BaseVisitor.VisitAssembly(AssemblyNode assembly, TargetFile target)
   at Microsoft.FxCop.Engines.Introspection.LoadVisitor.VisitAssembly(AssemblyNode assembly, TargetFile target)
   at Microsoft.FxCop.Engines.Introspection.LoadVisitor.Load(TargetFile target, Boolean buildTree, Boolean queueItems, AssemblyNode loadedAssembly)
   at Microsoft.FxCop.Engines.Introspection.LoadVisitor.LoadAssemblies(Queue queue, ExceptionCollection exceptions)</StackTrace>
  </Exception>

Non riesco a trovare nulla di rivelare su Google, quindi qualcuno ha qualche idea su cosa potrebbe causare questo?