6 monitors on one pc
 

Hi, folks! Here's my configuration:
1 PC (Advantech UNO-2271G v2)
2 externally powered USB hubs (7-port)
6 USB-powered monitors (DoubleSight DS-10U)

Here's my problem:
I can't get more than 5 monitors to display my app.... 1 monitor displays windows desktop.
The weird thing is that when I hover over my app with the mouse, I see all 6 windows!

This used to work with the old Uno 2271G V1, but doesn't seem to now....

Can anybody suggest anything I might try to get all 6 to display correctly?

Thanks for any help, pointers, or suggestions!,
Joe