I upgraded my ClientUI from 3 to 4 today and now when I open my project in Blend, it crashes with the following log information:

Microsoft® Expression® crash report:

Date: 2011-01-27 11-34-28
User: **************************

Application Version: 4.0.1000.1000
Operating System Version: Microsoft Windows NT 6.1.7600.0
Common Language Runtime Version: 4.0.30319.1

System.TypeLoadException: Method 'get_Product' in type 'Intersoft.Client.UI.Aqua.UXDock.UXDock' from assembly 'Intersoft.Client.UI.Aqua.UXDock, Version=3.0.5000.1, Culture=neutral, PublicKeyToken=c3d9b11444163e76' does not have an implementation.
   at System.Signature.GetSignature(SignatureStruct& signature, Void* pCorSig, Int32 cCorSig, RuntimeFieldHandleInternal fieldHandle, IRuntimeMethodInfo methodHandle, RuntimeType declaringType)
   at System.Reflection.RuntimePropertyInfo.get_Signature()
   at System.RuntimeType.RuntimeTypeCache.MemberInfoCache`1.PopulateProperties(Filter filter, RuntimeType declaringType, Int32* tkProperties, Int32 cProperties, Dictionary`2 csPropertyInfos, Boolean[] usedSlots, List`1 list)
   at System.RuntimeType.RuntimeTypeCache.MemberInfoCache`1.PopulateProperties(Filter filter, RuntimeType declaringType, Dictionary`2 csPropertyInfos, Boolean[] usedSlots, List`1 list)
   at System.RuntimeType.RuntimeTypeCache.MemberInfoCache`1.PopulateProperties(Filter filter)
   at System.RuntimeType.RuntimeTypeCache.MemberInfoCache`1.GetListByName(Char* pName, Int32 cNameLen, Byte* pUtf8Name, Int32 cUtf8Name, MemberListType listType, CacheType cacheType)
   at System.RuntimeType.RuntimeTypeCache.MemberInfoCache`1.Populate(String name, MemberListType listType, CacheType cacheType)
   at System.RuntimeType.RuntimeTypeCache.MemberInfoCache`1.GetMemberList(MemberListType listType, String name, CacheType cacheType)
   at System.RuntimeType.GetPropertyCandidates(String name, BindingFlags bindingAttr, Type[] types, Boolean allowPrefixLookup)
   at System.RuntimeType.GetProperties(BindingFlags bindingAttr)
   at Microsoft.Expression.DesignModel.Metadata.MemberCollection.CollectLocalProperties(Type runtimeType, List`1 propertyDescriptions)
   at Microsoft.Expression.DesignModel.Metadata.MemberCollection.ApplyToAllProperties(ApplyToPropertyDelegate action)
   at Microsoft.Expression.DesignModel.Metadata.MemberCollection.AddAllPropertiesIfNecessary()
   at Microsoft.Expression.DesignModel.Metadata.MemberCollection.GetMember(MemberType memberTypes, String memberName, MemberAccessTypes access)
   at Microsoft.Expression.DesignModel.Metadata.ProjectContextType.GetMember(MemberType memberTypes, String memberName, MemberAccessTypes access)
   at Microsoft.Expression.DesignModel.Metadata.PlatformTypeHelper.GetProperty(ITypeResolver typeResolver, ITypeId typeId, MemberType memberTypes, String memberName)
   at Microsoft.Expression.DesignModel.Metadata.PlatformTypes.GetNameProperty(ITypeResolver typeResolver, Type type)
   at Microsoft.Expression.DesignModel.Metadata.ClrObjectMetadata.<.ctor>b__0()
   at Microsoft.Expression.DesignModel.Metadata.DelayedInstance`1.get_Value()
   at Microsoft.Expression.DesignModel.Metadata.ClrObjectMetadata.Microsoft.Expression.DesignModel.Metadata.ITypeMetadata.get_NameProperty()
   at Microsoft.Expression.DesignModel.Metadata.ProjectContextType.Cache()
   at Microsoft.Expression.DesignModel.Metadata.ProjectContextType.Initialize(IXmlNamespace xmlNamespace, Type type, String key)
   at Microsoft.Expression.DesignModel.Metadata.TypeResolver.GetType(String key, IAssembly assembly, Type type)
   at Microsoft.Expression.DesignModel.Metadata.TypeResolver.GetType(Type type)
   at Microsoft.Expression.DesignSurface.Documents.ProjectXamlContext.GetType(Type type)
   at Microsoft.Expression.DesignModel.Metadata.ProjectContextType.Cache()
   at Microsoft.Expression.DesignModel.Metadata.ProjectContextType.Initialize(IXmlNamespace xmlNamespace, Type type, String key)
   at Microsoft.Expression.DesignModel.Metadata.TypeResolver.GetType(String key, IAssembly assembly, Type type)
   at Microsoft.Expression.DesignModel.Metadata.TypeResolver.GetType(Type type)
   at Microsoft.Expression.DesignSurface.Documents.ProjectXamlContext.GetType(Type type)
   at Microsoft.Expression.DesignModel.Metadata.XmlnsDefinitionMap.XmlNamespaceTypeMap.GetType(String typeName)
   at Microsoft.Expression.DesignModel.Metadata.XmlnsDefinitionMap.GetType(IXmlNamespace xmlNamespace, String typeName)
   at Microsoft.Expression.DesignSurface.Documents.SampleDataAwareNamespaceTypeResolver.GetType(IXmlNamespace xmlNamespace, String typeName)
   at Microsoft.Expression.DesignModel.Markup.XamlTypeHelper.ResolveTypeInternal(ITypeResolver typeResolver, IXmlNamespaceTypeResolver xmlNamespaceTypeResolver, XmlNamespace xmlNamespace, String typeName)
   at Microsoft.Expression.DesignModel.Markup.XamlTypeHelper.ResolveType(ITypeResolver typeResolver, IXmlNamespaceTypeResolver xmlNamespaceTypeResolver, XmlNamespace xmlNamespace, String typeName, Boolean inMarkupExtension)
   at Microsoft.Expression.DesignModel.Markup.XamlTypeHelper.GetTypeId(ITypeResolver typeResolver, ClrNamespaceUriParseCache documentNamespaces, XmlNamespace xmlNamespace, String typeName, Boolean instantiateUnrecognizedTypes, Boolean inMarkupExtension)
   at Microsoft.Expression.DesignModel.Markup.XamlTypeHelper.GetTypeId(XamlParserContext parserContext, ITextLocation lineInformation, XmlNamespace xmlNamespace, String typeName, Boolean inMarkupExtension)
   at Microsoft.Expression.DesignModel.Markup.XamlTypeHelper.GetTypeId(XamlParserContext parserContext, ITextLocation lineInformation, IXmlNamespaceResolver xmlNamespaceResolver, String fullTypeName, Boolean inMarkupExtension)
   at Microsoft.Expression.DesignModel.Markup.MarkupExtensionParser.CreateNodeFromTextValue(XamlParserContext parserContext, ITextLocation lineInformation, IDocumentNodeReference nodeReference, IXmlNamespaceResolver xmlNamespaceResolver, TypeConverter typeConverter, ITypeId valueTypeId, String value)
   at Microsoft.Expression.DesignModel.Markup.MarkupExtensionParser.GetPropertyValue(XamlParserContext parserContext, ITextLocation lineInformation, IDocumentNodeReference nodeReference, IXmlNamespaceResolver xmlNamespaceResolver, TypeConverter typeConverter, IType valueTypeId, String value, Boolean removeEscapeCharacters)
   at Microsoft.Expression.DesignModel.Markup.XamlParser.GetAttributeValue(XamlParserContext parserContext, ITextLocation lineInformation, DocumentCompositeNodeReference nodeReference, XmlElementReference xmlElementReference, TypeConverter typeConverter, ITypeId valueType, XmlAttribute attribute)
   at Microsoft.Expression.DesignModel.Markup.XamlParser.SetProperty(XamlParserContext parserContext, ITextLocation lineInformation, DocumentCompositeNodeReference nodeReference, XmlElementReference xmlElementReference, XmlAttribute attribute, IProperty propertyKey)
   at Microsoft.Expression.DesignModel.Markup.XamlParser.AddPropertiesAndChildren(XamlParserContext parserContext, DocumentCompositeNodeReference nodeReference, XmlElementReference xmlElementReference, XmlElement xmlElement, Predicate`1 propertyFilter)
   at Microsoft.Expression.DesignModel.Markup.XamlParser.ParseStyleOrTemplate(XamlParserContext parserContext, IDocumentNodeReference nodeReference, ITypeId type, XmlElementReference xmlElementReference, XmlElement xmlElement)
   at Microsoft.Expression.DesignModel.Markup.XamlParser.ParseElementContent(XamlParserContext parserContext, IDocumentNodeReference nodeReference, IType typeId, XmlElementReference xmlElementReference, XmlElement xmlElement)
   at Microsoft.Expression.DesignModel.Markup.XamlParser.ParseElement(XamlParserContext parserContext, IDocumentNodeReference nodeReference, XmlElementReference xmlElementReference, XmlElement xmlElement, DocumentNode& node)
   at Microsoft.Expression.DesignModel.Markup.XamlParser.ParseContent(XamlParserContext parserContext, IDocumentNodeReference nodeReference, XmlElementReference xmlElementReference, XmlElement xmlElement, IProperty childProperty, TypeConverter textTypeConverter, ITypeId textType, PropertyHandling propertyHandling)
   at Microsoft.Expression.DesignModel.Markup.XamlParser.AddPropertiesAndChildren(XamlParserContext parserContext, DocumentCompositeNodeReference nodeReference, XmlElementReference xmlElementReference, XmlElement xmlElement, Predicate`1 propertyFilter)
   at Microsoft.Expression.DesignModel.Markup.XamlParser.AddPropertiesAndChildren(XamlParserContext parserContext, DocumentCompositeNodeReference nodeReference, XmlElementReference xmlElementReference, XmlElement xmlElement)
   at Microsoft.Expression.DesignModel.Markup.XamlParser.ParseCompositeElement(XamlParserContext parserContext, IDocumentNodeReference nodeReference, IType typeId, XmlElementReference xmlElementReference, XmlElement xmlElement)
   at Microsoft.Expression.DesignModel.Markup.XamlParser.ParseElementContent(XamlParserContext parserContext, IDocumentNodeReference nodeReference, IType typeId, XmlElementReference xmlElementReference, XmlElement xmlElement)
   at Microsoft.Expression.DesignModel.Markup.XamlParser.ParseElement(XamlParserContext parserContext, IDocumentNodeReference nodeReference, XmlElementReference xmlElementReference, XmlElement xmlElement, DocumentNode& node)
   at Microsoft.Expression.DesignModel.Markup.XamlParser.ParseContent(XamlParserContext parserContext, IDocumentNodeReference nodeReference, XmlElementReference xmlElementReference, XmlElement xmlElement, IProperty childProperty, TypeConverter textTypeConverter, ITypeId textType, PropertyHandling propertyHandling)
   at Microsoft.Expression.DesignModel.Markup.XamlParser.AddPropertiesAndChildren(XamlParserContext parserContext, DocumentCompositeNodeReference nodeReference, XmlElementReference xmlElementReference, XmlElement xmlElement, Predicate`1 propertyFilter)
   at Microsoft.Expression.DesignModel.Markup.XamlParser.AddPropertiesAndChildren(XamlParserContext parserContext, DocumentCompositeNodeReference nodeReference, XmlElementReference xmlElementReference, XmlElement xmlElement)
   at Microsoft.Expression.DesignModel.Markup.XamlParser.ParseCompositeElement(XamlParserContext parserContext, IDocumentNodeReference nodeReference, IType typeId, XmlElementReference xmlElementReference, XmlElement xmlElement)
   at Microsoft.Expression.DesignModel.Markup.XamlParser.ParseElementContent(XamlParserContext parserContext, IDocumentNodeReference nodeReference, IType typeId, XmlElementReference xmlElementReference, XmlElement xmlElement)
   at Microsoft.Expression.DesignModel.Markup.XamlParser.ParseRootElement(XamlParserContext parserContext, XmlElementReference xmlElementReference, XmlElement xmlElement)
   at Microsoft.Expression.DesignModel.Markup.XamlParser.Parse(XamlParserContext parserContext, XmlDocumentReference xmlDocumentReference, XmlDocument xmlDocument)
   at Microsoft.Expression.DesignModel.Markup.XamlParser.ParseInternal(XamlParserContext parserContext)
   at Microsoft.Expression.DesignModel.Markup.XamlDocument..ctor(IDocumentContext documentContext, ITypeId expectedRootType, ITextBuffer textBuffer, Encoding documentEncoding, IXamlSerializerFilter defaultXamlSerializerFilter)
   at Microsoft.Expression.DesignSurface.Documents.SceneXamlDocument..ctor(IDocumentContext documentContext, IUndoService undoService, ITypeId expectedRootType, ITextBuffer textBuffer, Encoding documentEncoding)
   at Microsoft.Expression.DesignSurface.Documents.XamlDocumentType.CreateDocument(IProject project, IProjectItem projectItem, ITextBuffer textBuffer, Boolean isReadOnly, Encoding encoding)
   at Microsoft.Expression.DesignSurface.Documents.XamlDocumentType.CreateDocument(IProject project, IProjectItem projectItem, String contents, Boolean isReadOnly, Encoding encoding)
   at Microsoft.Expression.DesignSurface.Documents.XamlDocumentType.OpenDocument(IProjectItem projectItem, IProject project, Boolean isReadOnly)
   at Microsoft.Expression.Project.ProjectItem.OpenDocument(Boolean isReadOnly, Boolean suppressUI)
   at Microsoft.Expression.Project.ProjectItemBase.OpenView(Boolean makeActive)
   at Microsoft.Expression.Project.VisualStudioSolution.OpenInitialViews()
   at Microsoft.Expression.Project.ProjectManager.OpenSolution(DocumentReference solutionOrProjectReference, Boolean addToRecentList, Boolean openInitialScene)
   at Microsoft.Expression.Project.Commands.OpenRecentProject.Execute()
   at Microsoft.Expression.Framework.Commands.CommandTarget.Execute(String commandName, CommandInvocationSource invocationSource)
   at Microsoft.Expression.Framework.Commands.CommandService.Execute(String commandName, CommandInvocationSource invocationSource)
   at Microsoft.Expression.Blend.WelcomeScreen.OpenProjectCommandCore()
   at Microsoft.Expression.Blend.WelcomeScreen.ProjectsListBox_ItemActivate(Object source, EventArgs e)
   at Microsoft.Expression.Blend.ItemActivateListBox.OnItemActivate(EventArgs e)
   at Microsoft.Expression.Blend.ItemActivateListBox.OnSelectionChanged(SelectionChangedEventArgs e)
   at System.Windows.Controls.Primitives.Selector.InvokeSelectionChanged(List`1 unselectedItems, List`1 selectedItems)
   at System.Windows.Controls.Primitives.Selector.SelectionChanger.End()
   at System.Windows.Controls.Primitives.Selector.SetSelectedHelper(Object item, FrameworkElement UI, Boolean selected)
   at System.Windows.Controls.Primitives.Selector.NotifyIsSelectedChanged(FrameworkElement container, Boolean selected, RoutedEventArgs e)
   at System.Windows.Controls.Primitives.Selector.OnSelected(Object sender, RoutedEventArgs e)
   at System.Windows.RoutedEventHandlerInfo.InvokeHandler(Object target, RoutedEventArgs routedEventArgs)
   at System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)
   at System.Windows.UIElement.RaiseEventImpl(DependencyObject sender, RoutedEventArgs args)
   at System.Windows.UIElement.RaiseEvent(RoutedEventArgs e)
   at System.Windows.Controls.ListBoxItem.OnSelected(RoutedEventArgs e)
   at System.Windows.Controls.ListBoxItem.OnIsSelectedChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
   at System.Windows.DependencyObject.OnPropertyChanged(DependencyPropertyChangedEventArgs e)
   at System.Windows.FrameworkElement.OnPropertyChanged(DependencyPropertyChangedEventArgs e)
   at System.Windows.DependencyObject.NotifyPropertyChange(DependencyPropertyChangedEventArgs args)
   at System.Windows.DependencyObject.UpdateEffectiveValue(EntryIndex entryIndex, DependencyProperty dp, PropertyMetadata metadata, EffectiveValueEntry oldEntry, EffectiveValueEntry& newEntry, Boolean coerceWithDeferredReference, Boolean coerceWithCurrentValue, OperationType operationType)
   at System.Windows.DependencyObject.SetValueCommon(DependencyProperty dp, Object value, PropertyMetadata metadata, Boolean coerceWithDeferredReference, Boolean coerceWithCurrentValue, OperationType operationType, Boolean isInternal)
   at System.Windows.DependencyObject.SetCurrentValueInternal(DependencyProperty dp, Object value)
   at System.Windows.Controls.ListBox.NotifyListItemClicked(ListBoxItem item, MouseButton mouseButton)
   at System.Windows.Controls.ListBoxItem.HandleMouseButtonDown(MouseButton mouseButton)
   at System.Windows.Controls.ListBoxItem.OnMouseLeftButtonDown(MouseButtonEventArgs e)
   at System.Windows.UIElement.OnMouseLeftButtonDownThunk(Object sender, MouseButtonEventArgs e)
   at System.Windows.Input.MouseButtonEventArgs.InvokeEventHandler(Delegate genericHandler, Object genericTarget)
   at System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object target)
   at System.Windows.RoutedEventHandlerInfo.InvokeHandler(Object target, RoutedEventArgs routedEventArgs)
   at System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)
   at System.Windows.UIElement.ReRaiseEventAs(DependencyObject sender, RoutedEventArgs args, RoutedEvent newEvent)
   at System.Windows.UIElement.OnMouseDownThunk(Object sender, MouseButtonEventArgs e)
   at System.Windows.Input.MouseButtonEventArgs.InvokeEventHandler(Delegate genericHandler, Object genericTarget)
   at System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object target)
   at System.Windows.RoutedEventHandlerInfo.InvokeHandler(Object target, RoutedEventArgs routedEventArgs)
   at System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)
   at System.Windows.UIElement.RaiseEventImpl(DependencyObject sender, RoutedEventArgs args)
   at System.Windows.UIElement.RaiseTrustedEvent(RoutedEventArgs args)
   at System.Windows.UIElement.RaiseEvent(RoutedEventArgs args, Boolean trusted)
   at System.Windows.Input.InputManager.ProcessStagingArea()
   at System.Windows.Input.InputManager.ProcessInput(InputEventArgs input)
   at System.Windows.Input.InputProviderSite.ReportInput(InputReport inputReport)
   at System.Windows.Interop.HwndMouseInputProvider.ReportInput(IntPtr hwnd, InputMode mode, Int32 timestamp, RawMouseActions actions, Int32 x, Int32 y, Int32 wheel)
   at System.Windows.Interop.HwndMouseInputProvider.FilterMessage(IntPtr hwnd, WindowMessage msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
   at System.Windows.Interop.HwndSource.InputFilterMessage(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
   at MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
   at MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o)
   at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
   at MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(Object source, Delegate method, Object args, Int32 numArgs, Delegate catchHandler)
   at System.Windows.Threading.Dispatcher.InvokeImpl(DispatcherPriority priority, TimeSpan timeout, Delegate method, Object args, Int32 numArgs)
   at MS.Win32.HwndSubclass.SubclassWndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam)
   at MS.Win32.UnsafeNativeMethods.DispatchMessage(MSG& msg)
   at System.Windows.Threading.Dispatcher.PushFrameImpl(DispatcherFrame frame)
   at System.Windows.Threading.Dispatcher.PushFrame(DispatcherFrame frame)
   at System.Windows.Window.ShowHelper(Object booleanBox)
   at System.Windows.Window.Show()
   at System.Windows.Window.ShowDialog()
   at Microsoft.Expression.Blend.WelcomeScreen..ctor(IServices services)
   at Microsoft.Expression.Blend.BlendApplication.OnFirstIdle()
   at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
   at MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(Object source, Delegate method, Object args, Int32 numArgs, Delegate catchHandler)
   at System.Windows.Threading.DispatcherOperation.InvokeImpl()
   at System.Windows.Threading.DispatcherOperation.InvokeInSecurityContext(Object state)
   at System.Threading.ExecutionContext.runTryCode(Object userData)
   at System.Runtime.CompilerServices.RuntimeHelpers.ExecuteCodeWithGuaranteedCleanup(TryCode code, CleanupCode backoutCode, Object userData)
   at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state)
   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean ignoreSyncCtx)
   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
   at System.Windows.Threading.DispatcherOperation.Invoke()
   at System.Windows.Threading.Dispatcher.ProcessQueue()
   at System.Windows.Threading.Dispatcher.WndProcHook(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
   at MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
   at MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o)
   at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
   at MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(Object source, Delegate method, Object args, Int32 numArgs, Delegate catchHandler)
   at System.Windows.Threading.Dispatcher.InvokeImpl(DispatcherPriority priority, TimeSpan timeout, Delegate method, Object args, Int32 numArgs)
   at MS.Win32.HwndSubclass.SubclassWndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam)
   at MS.Win32.UnsafeNativeMethods.DispatchMessage(MSG& msg)
   at System.Windows.Threading.Dispatcher.PushFrameImpl(DispatcherFrame frame)
   at System.Windows.Threading.Dispatcher.PushFrame(DispatcherFrame frame)
   at System.Windows.Threading.Dispatcher.Run()
   at System.Windows.Application.RunDispatcher(Object ignore)
   at System.Windows.Application.RunInternal(Window window)
   at System.Windows.Application.Run(Window window)
   at Microsoft.Expression.Framework.ExpressionApplication.RunApplication()
   at Microsoft.Expression.Application.Main(String[] args)