uv mapping fatal error vers 2.4

I try to map a model, give this error (but not so on all models)   
(sistem : win 7 /64   , e5300  , 4g ram)

I think this problem occurs when: select a poly -> duplicate -> break into separate meshes, if you use break into separate objects is not error

Code: [Select]

System.IndexOutOfRangeException: Index was outside the bounds of the array.
   at DigitalFossil.AnimationDesign.AnimationDesignGraphicWindow.ModelDesigner.UVUnwrapOp.UVUnwrapFormDerived.set_ComponentCurrent(Component value)
   at DigitalFossil.AnimationDesign.AnimationDesignGraphicWindow.ModelDesigner.UVUnwrapOp.UVUnwrapFormDerived.ApplySelectionRecordData(Boolean rebuildBasicItemsNeeded, CharacterHolder characterRecord, Component componentRecord, Int32 textureIndex, Vector2 offsetRecord, Vector2 sizeRecord, ArrayList selectedIndices, ArrayList lockedIndices, ArrayList softSelectedIndices, ArrayList softSelectedWeights)
   at DigitalFossil.AnimationDesign.AnimationDesignGraphicWindow.ModelDesigner.UVUnwrapOp.ApplySelectionRecordData(Boolean rebuildBasicItemsNeeded, CharacterHolder characterRecord, Component componentRecord, Int32 textureIndex, Vector2 offsetRecord, Vector2 sizeRecord, ArrayList selectedIndices, ArrayList lockedIndices, ArrayList softSelectedIndices, ArrayList softSelectedWeights, ArrayList vertexPullStringLengths, ArrayList holeFillVertexPositions)
   at DigitalFossil.AnimationDesign.AnimationDesignGraphicWindow.ModelDesigner.UndoRedoManager.ApplyKeyRecord(Record record, Record oppositeRecord, Boolean multyPasses, Boolean isSubobjectSelectionStackRecord)
   at DigitalFossil.AnimationDesign.AnimationDesignGraphicWindow.ModelDesigner.UndoRedoManager.UndoInternal(Boolean multyPasses)

If you can reproduce the error, can you send me the model and the steps to reproduce it at info@digitalfossils.com?

I do not have that model, but with another model I could not reproduce that error 

I think I know what causes the problem and hopefully it has been fixed in the new version.