Bert Freudenberg uploaded a new version of ToolBuilder-Morphic to project The Trunk:
http://source.squeak.org/trunk/ToolBuilder-Morphic-bf.86.mcz

==================== Summary ====================

Name: ToolBuilder-Morphic-bf.86
Author: bf
Time: 11 June 2012, 5:19:14.892 pm
UUID: 569006ce-65da-4aec-aa47-cc82284627e1
Ancestors: ToolBuilder-Morphic-cmm.85

Protect dropping in lists.

=============== Diff against ToolBuilder-Morphic-cmm.85 ===============

Item was changed:
  ----- Method: PluggableListMorphPlus>>acceptDroppingMorph:event: (in category 'drag and drop') -----
  acceptDroppingMorph: aMorph event: evt
  	| item |
+ 	dropItemSelector isNil | potentialDropRow isNil ifTrue: [^self].
- 	dropItemSelector ifNil:[^self].
  	item := aMorph passenger.
  	model perform: dropItemSelector with: item with: potentialDropRow.
  	self resetPotentialDropRow.
  	evt hand releaseMouseFocus: self.
  	Cursor normal show.
  !