Not sure why. Perhaps try this sample file
with the earlier set of formulas implemented & working properly:
http://www.freefilehosting.net/download/3f1h2
Extract uniques based on 2 cols n by latest date.xls

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Max
Singapore
http://savefile.com/projects/236895
xdemechanik
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<annysjunkmail@... wrote
Hi Max,
This is a very clever approach...I thought it was VBA specific but I
cannot get it to work properly.
I am entering your formulas as described in the correct order. Cols
F:H work correctly in that they return values but when I enter the
array it shows blanks?
Any thoughts?
Thanks for your time

Chris