That message should only appear if another computer has connected to the computer requesting a KVM connection and does not have suitable login details.
Do you have the Multiplicity sidebar running?
If you click KVM control settings you should be able to disable the setting to allow one time pass codes. This will stop any messages if they are coming from the network side of things.
That said the message can also only show IF KVM connections are allowed as without that enabled no incoming connections will succeed. The only other way to show it would be due to something local to the computer causing a prompt.
The prompt should indicate what is trying to connect to it "A user on computer %xxxxx% would like to remote control your computer.". It sounds like that bit is blank?
For now if you pick the unload option on the secondary, go to the Multiplicity folder and rename MultiSrv and multisrv64.exe to something else it will stop it showing any messages.
We continue to investigate this however.
