When I connect to the secondary, I see the desktop (of the secondary) on my primary computer. I can move the mouse and start applications. The applications start on the secondary computer, and show on its screen.
That all sounds like a Successful KVM (remote) connection as opposed to a Seamless one.
However on the primary computer you only see the desktop, no changes are shown.
This is where you lose me. Nothing should happen on the Primary PC desktop during a KVM connection. What are you expecting?
Stardock Support Manager