Access to Excel 2007 curious behavior

[artificial]

I have written an application that worked fine with Excel 2003.
I have upgraded to Excel 2007 and some problems occur when translating
Access tables into Excel charts.

Here is the sample of code of that worked fine with Excel 2003 :

Dim Excel As Excel.Application

Set Excel = New Excel.Application


Excel.Workbooks.Add


Dim worksheet As Excel.worksheet

Dim r As Recordset
I = 1

Screen.MousePointer = 11

Excel.Sheets(1).Select

With Excel.ActiveSheet

'Columnheaders
..Range("A" & I).Value = "profileNumber"
..Range("B" & I).Value = "templateNumber"
..Range("C" & I).Value = "typeNumber"
..Range("D" & I).Value = "dates"


I = I + 1


On Error Resume Next

Set r = G_DBManager.GetModelElementsCount

Dim count As Long


r.MoveFirst

Do Until r.EOF
..Range("A" & I).Value = r("profileNumber")
..Range("B" & I).Value = r("templateNumber")
..Range("C" & I).Value = r("typeNumber")
..Range("D" & I).Value = r("dates")


I = I + 1
r.MoveNext
Loop
' End If
count = r.RecordCount + 1
r.Close
..Range("D").NumberFormat = "m/d/yy"
Excel.Visible = True



End With


Excel.Charts.Add


With Excel.ActiveChart

..ChartType = xlLineMarkers
..HasAxis(xlCategory, xlPrimary) = True
..HasAxis(xlValue, xlPrimary) = True
..Axes(xlCategory).AxisBetweenCategories = True
..Axes(xlCategory, xlPrimary).CategoryType = xlCategoryScale
..Axes(xlCategory, xlPrimary).HasTitle = True
..Axes(xlCategory, xlPrimary).AxisTitle.Characters.Text = "date"
..Axes(xlValue, xlPrimary).HasTitle = True
..Axes(xlValue, xlPrimary).AxisTitle.Characters.Text = _
"Count of Model Elements"
..HasTitle = True
..ChartTitle.Characters.Text = "Count of Model Elements"

..SetSourceData Source:=Excel.ActiveSheet.Range("A1:C" & count), PlotBy:= _
xlColumns
..SeriesCollection(1).Values = "=Sheet1!R2C1:R" & count & "C1"
..SeriesCollection(1).name = "=Sheet1!R1C1"
..SeriesCollection(2).Values = "=Sheet1!R2C2:R" & count & "C2"
..SeriesCollection(2).name = "=Sheet1!R1C2"
..SeriesCollection(3).Values = "=Sheet1!R2C3:R" & count & "C3"
..SeriesCollection(3).name = "=Sheet1!R1C3"
..SeriesCollection(1).XValues = "=Sheet1!R2C4:R" & count & "C4"
..Location Where:=xlLocationAsObject, name:="Sheet1"


The chart is a Line type. The first 3 columns are the 3 parameters.( Y axis
value) .The 4th column is the date column ( X axis).

The problem is that the chart put the 4th column(dates) as a Y axis value in
Excel 2007.This is curious , especially since no problem was found for Excel
2003.
What is the problem with excel 2007 ?