Mr Gadget-
Thanks for your response.
1) Yes, I would agree that the inventory scanner reported the values it saw the first time it read the new Custom Data fields I created.
2) Yes, I did run a FULL SYNC SCAN (right click | Inventory Scan | FULL SYNC SCAN). I've run this repeatedly.
3) I ran the file to a text file on my desktop. The file had "wrong" values. It contained the values I see in Inventory.
It appears that once established, the CUSTOM DATA fields are never updated again.