GAMES IN KVM MODE in multiplicity pro

multiplicity pro makes life simple,no doubt about that, my primary is my laptop and one of my secondary is desktop and in kvm mode everything works fine except games,when i run i just get black screen (but game is working running in desktop fine but black screen in kvm screen(laptop)).if i close the game then everything is back to normal as expected .I will not use it but i am quite interested to know why? multiplicity will not detect full screen directx games or i have some problem with my setup? i tested  via local network only ,

Thanks.