I changed the properties by deselecting visual themes desktop composition and scaling on high DPI settings in the shortcut and the problem was resolved but only for that session - it has not worked since and therefore may have been a coincidence. I have tried with the latest 2 nVidia drivers.
Every other time I have run ArmA 3 since the first alpha release this issue has occurred.
This problem renders the game pretty much unplayable as I never know what is going on right from the start menu to exiting.