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I think there may be a bug with _ArrayUnique introduced in 3.3.14 (or it could just be me). I updated ticket #3078 with the attached files to demonstrate. If you run test.au3 against the test data file in 3.3.12 it works and you see a unique array from _arrayDisplay. If you do the same in 3.3.14 the _arrayDisplay view will be empty. I read the script breaking changes and the updates but I don't think it should have cause this. Please let me know if I am doing something wrong. #include <Excel.au3> #include <Array.au3> func _openSourceData() $sourcefile=FileOpenDialog("Please select source file",@ScriptDir,"All (*.*)") If @error Then ; Display the error message. MsgBox($MB_SYSTEMMODAL, "", "No file(s) were selected.") else ; Create application object Local $oAppl = _Excel_Open() If @error Then Exit MsgBox(16, "Excel UDF: _Excel_BookOpen Example", "Error creating the Excel application object." & @CRLF & "@error = " & @error & ", @extended = " & @extended) ; ***************************************************************************** ; Open an existing workbook and return its object identifier. ; ***************************************************************************** Local $sWorkbook = $sourcefile $oWorkbook = _Excel_BookOpen($oAppl, $sWorkbook, Default, Default, True) If @error Then Exit MsgBox($MB_SYSTEMMODAL, "Excel UDF: _Excel_BookOpen Example 1", "Error opening '" & $sWorkbook & "'." & @CRLF & "@error = " & @error & ", @extended = " & @extended) $sourceArray=_Excel_RangeRead($oWorkbook) _ArrayDisplay($sourceArray) $unique=_ArrayUnique($sourceArray) _ArrayDisplay($unique) EndIf EndFunc _openSourceData() test.au3 testData2.xlsx