SUMPRODUCT & Dynamic Range: Total All The Blank InDates For Each Technician By Employee Number

I have what I thought was going to be a simple function to create and, after a week of getting more error messages than I've had in a year, I'm ready to throw in the towel. Situation: There are two worksheets in the same workbook [Excel 2003]. One is for "Posting" details about technicians and their work orders. The other is a "Report" that summarizes the number of workorders open, closed, etc.

In the "Posting" sheet, I have created dynamic name ranges for two columns: Technician (4-digit text field) and InDate (date field that, if blank, means that the technician has not closed this work order. My ranges are set up like this:

Technician=OFFSET(Posting!$B$2,0,0,COUNT(Posting!$B:$B),1)
InDate=OFFSET(Posting!$D$2,0,0,COUNT(Posting!$D:$D),1)

So all I need to do is to total all the blank InDates for each Technician by employee number. I've tried COUNT to SUMPRODUCT. A co-worker got it to work with using...=SUMPRODUCT((ISBLANK(Posting!$D$2:$D$65307))*(Posting!$B$2:$B$65307=4288))
His solution was to list almost every available cell in each column. I just can't help but think that the dynamic name range should be able to work but I can't get it right. I think I'll choke if I get one more "N/A" or "VALUE! error.