Hi,
this is really a troublesome little bugger!
I think I found what was not working and caused the error messages. Try the attached now.
I have saved is as a XL 2003 *.xls file, so some of the finer points of XL 2007 formatting and functions may have been lost, but you should see the chart working and changing every time you hit F9.
Of course, you can save this now as a XL2007 file and continue from there.
hope that helps
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