Legend - Position Property In 2007

I have a 2003 vs. 2007 problem that I've spent a week or so trying to resolve, to no avail. I have created a fairly complex "dictator application" in Excel 2003. The application performs a bunch of calculations, and stores this inforamtion in a template workbook. The template itself contains one worksheet (to hold the data), and twelve empty "chart-sheets" which I later use to create plots. Of course, everything works fine and life is good in Excel 2003.

Flash forward two years, and half of my company is running 2007. When a 2007 user fires the plot creation routine, he is greated with a lovely error message (# 2147467259): "Method 'Position' of object 'Legend' failed".

Here's the full procedure I'm running to create the plots and position the legends:

Function bChartSumFileData(ByVal lTotalPlots As Long)

Const sSOURCE As String = "bChartSumFileData" 'Procedure Name (error-handling)

Dim bReturn As Boolean
Dim i As Long, j As Long, lNumSeries As Long
Dim sTemp As String, sPlotSetting As String

Dim chtTemp As Chart
Dim wksData As Worksheet, wksInfo As Worksheet
Dim serTemp As Series
Dim uSettings As CHART_SETTINGS
Dim vaPlotInfo As Variant

Obviously, lots of custom functions here; I'm also using a custom "type" to store chart settings (which I read from a *.txt file in a separate function). However, as far as the Legend goes, it shouldn't make a difference with the above code. When I stop execution after the error and look at the template workbook, the chart is created just fine, and the legend is visible, so I'm not sure why the error is occuring. Even better, the number of charts created prior to erroring-out is not fixed: sometimes the error occurs on the first plot, sometimes on the third, etc.