CHB walkback CategoryTreeModel(Object)>>errorNotFound

Hi,

I got the walkback below in a CHB in a fairly fresh image. The CHB is now in
a state where if I select a new class, the methods list is not updated.

3:17:29 PM, Sunday, 15 May 2005: 'Not found: development'
CategoryTreeModel(Object)>>errorNotFound:
[] in CategoryTreeModel(TreeModel)>>getNodeFor:
LookupTable>>at:ifAbsent:
CategoryTreeModel(TreeModel)>>getNodeFor:ifAbsent:
CategoryTreeModel(TreeModel)>>getNodeFor:
CategoryTreeModel(TreeModel)>>parentNodeOf:
CategoryTreeModel(TreeModel)>>parentOf:
CategoryTreeModel(TreeModelAbstract)>>allParentsOf:
CategoryTreeModel(TreeModelAbstract)>>withAllParents:
[] in ClassBrowserAbstract>>allCategoriesOfMethod:
IdentitySet(Set)>>do:
ClassBrowserShell(ClassBrowserAbstract)>>allCategoriesOfMethod:
ClassBrowserShell(ClassBrowserAbstract)>>onMethodSelected
EventMessageSend>>forwardTo:withArguments:
EventMessageSend>>value
[] in MessageSequenceAbstract>>value
EventMessageSequence>>messagesDo:
EventMessageSequence(MessageSequenceAbstract)>>value
EventsCollection>>triggerEvent:
MethodBrowser(Object)>>trigger:
MethodBrowser>>onMethodSelected
EventMessageSend>>forwardTo:withArguments:
EventMessageSend>>value
[] in MessageSequenceAbstract>>value
EventMessageSequence>>messagesDo:
EventMessageSequence(MessageSequenceAbstract)>>value
EventsCollection>>triggerEvent:
ListPresenter(Object)>>trigger:
ListView(ListControlView)>>onSelectionChanged
ListPresenter(SelectableItemsPresenter)>>onSelectionChanged
ListView(ListControlView)>>onSelChanged:
ListView>>onSelChanged:
ListView(ListControlView)>>onSelChanged
ListView>>maybeSelChanging:
ListView>>nmClick:
ListView(ControlView)>>nmNotify:
ListView>>nmNotify:
ReferenceView(View)>>wmNotify:wParam:lParam:
ReferenceView(View)>>dispatchMessage:wParam:lParam:
[] in InputState>>wndProc:message:wParam:lParam:cookie:
BlockClosure>>ifCurtailed:
ProcessorScheduler>>callback:evaluate:
InputState>>wndProc:message:wParam:lParam:cookie:
ListView(ControlView)>>defaultWindowProcessing:wParam:lParam:
ListView(View)>>defaultWindowProcessing:
ListView>>onButtonPressed:
ListView>>onLeftButtonPressed:
ListPresenter(Presenter)>>onLeftButtonPressed:
ListView(View)>>wmLButtonDown:wParam:lParam:
ListView(View)>>dispatchMessage:wParam:lParam: