I had same issue, but my keyboard was a rather nice (but old) cherry based IBM branded keyboard. On further research I found a lot of the better quality keyboards just don't support the hotkey type KVMs (the type that switch using a key on the keyboard) I was reccomended by several people who I know in industry to either not bother (in their words get another monitor) or to spend a little more on the KVM and get one with a built in switch... To cut a long story short my cheapo KVM is now a monitor extension cable, and I have another monitor.