���Simple inspect��� works fine.

THe trace is:

UndefinedObject(Object)>>doesNotUnderstand: #new
Message>>sentTo:
UndefinedObject(Object)>>doesNotUnderstand: #new
XMLDocumentHighlightDefaults class(XMLHighlightDefaults class)>>textColorForShoutProperty:
XMLDocumentHighlightDefaults class(XMLHighlightDefaults class)>>defaultDefaultColor
XMLDocumentHighlightDefaults(XMLHighlightDefaults)>>defaultColor
XMLDocumentHighlighter(XMLHighlighter)>>initializeColorsWithDefaults:
XMLDocumentHighlighter>>initializeColorsWithDefaults:
XMLDocumentHighlighter(XMLHighlighter)>>initialize
XMLDocumentHighlighter class(Behavior)>>new
XMLHighlightingWriter>>on:
XMLHighlightingWriter class(XMLWriter class)>>on:
XMLHighlightingWriter class(XMLWriter class)>>new
XMLDocument(XMLNode)>>asHighlightedTextWrittenWith:
XMLDocument(XMLNode)>>treeViewLabelText
[ :each | each treeViewLabelText ] in XMLDocument(XMLNode)>>gtInspectorTreeIn:inContext: in Block: [ :each | each treeViewLabelText ]
BlockClosure>>glamourValueWithArgs:
BlockClosure(ProtoObject)>>glamourValue:
GLMTreePresentation(GLMFormatedPresentation)>>formatedDisplayValueOf:
GLMTreeMorphNodeModel>>displayText
GLMTreeMorphNodeModel>>elementColumn
[ :node :cont | node perform: self rowMorphGetSelector ] in MorphTreeColumn>>rowMorphGetterBlock in Block: [ :node :cont | node perform: self rowMorphGetSele...etc...
MorphTreeColumn>>rowMorphFor:
[ :col |
| v |
v := col rowMorphFor: complexContents.
controls add: v.
col -> v ] in MorphTreeNodeMorph>>buildRowMorph in Block: [ :col | ...
OrderedCollection>>collect:
MorphTreeNodeMorph>>buildRowMorph
MorphTreeNodeMorph>>initRow
MorphTreeNodeMorph>>initWithContents:prior:forList:indentLevel:
[ :item :idx |
priorMorph := self indentingItemClass new
�� �� �� �� initWithContents: item
�� �� �� �� prior: priorMorph
�� �� �� �� forList: self
�� �� �� �� indentLevel: newIndent.
firstAddition ifNil: [ firstAddition := priorMorph ].
morphList add: priorMorph.
"Was this row expanded ? if true -> expand it
�� �� �� �� �� �� �� �� �� �� �� �� again "
((item hasEquivalentIn: expandedItems) or: [ priorMorph isExpanded ])
�� �� �� �� ifTrue: [ priorMorph isExpanded: true.
�� �� �� �� �� �� �� �� priorMorph
�� �� �� �� �� �� �� �� �� �� �� �� addChildrenForList: self
�� �� �� �� �� �� �� �� �� �� �� �� addingTo: morphList
�� �� �� �� �� �� �� �� �� �� �� �� withExpandedItems: expandedItems ] ] in GLMPaginatedMorphTreeMorph(MorphTreeMorph)>>addMorphsTo:from:withExpandedItems:atLevel: in Block: [ :item :idx | ...
OrderedCollection(SequenceableCollection)>>withIndexDo:



.

If it isn���t obvious what is going wrong from the above, I gues the thing to do is reinstall Pharo, and go through the steps of installing the various packages while recording them. If I get the same error, I���ll post the video of what I did�� on youtube. If I don���t an error, then it was operator error from the start, obviously.