Windows 10 (Anniversary) with 4 monitors (2 DisplayLink)

[AlbanRampon]

Hello,

Would you please be able to give us logs to look at?

I suspect what you have is a machine with the primary graphics drivers using WDDM v1.3 standard.
In that version, "DWM Clone" feature was not compulsory so not always implemented.
When we had access to the primary graphics card driver, we could override the graphics card primary features. However, with the new native DisplayLink USB graphics support of the OS, we have to use the OS calls and therefore cannot add clone to graphics drivers not advertising it.
If that's the case, the only solution would be to get new graphics drivers... and if they are WDDM 1.3, the machine is likely to be old enough for the graphics card manufacturer not to be very motivated.

Kind regards,
Alban