Robin,
The original poster and I work together. I believe we have found a work around. The NFRC ID you assign the laminate when saving it in Optics needs to match the WINDOW ID for the new record when importing into WINDOW. If these two values match, the data comes through. If these two values do not match, the imported record in WINDOW has zero values.
Attached is a screen shot showing the first (failed) import under ID 40013 (which I subsequently renamed with DO NOT USE after the name, for my own purposes), and the second successful import under ID 40014.
I don't recall previous versions of WINDOW having this behaviour (v7.4 or v7.6).
Crystal