I have an Aten MasterView DVI KVMP CS-1764, and a 2010 MacBook Air with a mini-DisplayPort adapter.
I'm outputting at native resolution (1920x1200) to my Dell 2407WFP, but the screen periodically flashes snow flicker on between 20% and 80% of the vertical length of the screen.
From Apple's discussion forums, it seems this issue happens with a lot of KVMs and Apple computers. Neither the monitor, nor the KVM are HDCP compliant, which I think may be related.
Does anyone know if there is a way to get an uncorrupted image on my screen through the KVM?