Had previously updated drivers and firmware after upgrade - just to be sure rechecked drivers and found following and updated
Intel AMT HECI Driver | XPS-8700_Chipset_Driver_VJ54R_WN32_11.0.0.1153_A00.EXE (76MB) (18 MB of 76MB)
Do not believe has any bearing but not positive.
Also update on workaround, all that is required is, in active area of desktop, right click and select display settings as above. No need to use virtual desktop.