In KVM mode, whenever my secondary machine wakes from sleep, I only get a black screen on my primary machine when I reconnect to the secondary.
Mouse and keyboard inputs work fine, I can type on the primary and see it show up on the secondary, but the display on the primary just stays black.
The only thing that fixes this is restarting the secondary machine.
I've tried unloading and restarting only Multiplicity on both machines to fix it, but that doesn't change anything.
The only thing that seems to work is rebooting the secondary.