Mouse cursor becomes extremely slow/unresponsive in KVM mode the instant it enters the secondary PC. Once you're able to finally get the mouse cursor back to the primary PC, the mouse cursor movement returns to normal on the primary until you move it back to the secondary. This only happens at power on and on resume from hibernate on the primary PC. There is no problem on resume from sleep.

I have isolated this unwanted behavior to occur whenever NordVPN was shown running in Task Manager (it is set to autorun at startup but not to auto-connect to VPN). So now, at every power on/resume from hibernate, in order to get the mouse cursor to move normally within the secondary PC, I have to use the following workaround (this only has to be done on the primary PC):

[Click 'Quit App' from the NordVPN system tray icon then select 'End task' on 'NordVPN' in Task Manager.]

The mouse cursor then immediately moves correctly within the secondary PC. I can now run NordVPN if I choose to and the mouse continues to function properly across the primary and secondary PCs until I restart the computer or resume from hibernate (at which point I have to perform the steps above again.)

NordVPN has a lot of security settings, and I have tried it with all features on and all features off to no avail. Even with its option selected to not allow background processes, at program exit from the system tray, the cursor is still problematic in the secondary PC. I do not have this problem with Multiplicity 3 KVM Pro.