Agent inventories Macs HW only or none seemingly at random

The Inventory Only Agent (10.3) has NEVER worked in our heterogenous environment. After investigating the installation, OS, logs, etc., here is what I have found so far:

1. The installation goes smoothly and indicates that in the /var/log/zenumia-install.log
2. The inventory files (sp.spx, *-last.pdict) on the client have full inventories
3. There is nothing that differentiates the HW