In Device Manager -> Display Adapters
We have disabled the “Standard VGA Graphics Adapter”
– we only have active the Citrix ones:
Citrix Display Driver(Citrix Systems – WDDM)
Citrix Display Driver Mirror Driver
Citrix Systems Inc. Display Mirror Driver
Nothing else is being listed.
This was about 50 glitches ago in our new SOE – but yes was a SPAN type issue. Single monitor was OK. If I remember Mirroring was OK as well .. but can’t be sure.