I would say that the last test would exclude the monitor as a possible culprit .

What OS and video card are you running . Maybe it is some kind of driver bug .

Windows 10 Pro
Nvidia GeForce GTX 1050 ti

MI is a real mode game, have you tried increasing the cycles?

I Don't Remember to be Honest
How Much I Have to increase?

Mark_81 wrote on 2020-07-08, 18:04:

Windows 10 Pro
Nvidia GeForce GTX 1050 ti

Sorry, I just saw you had already posted that info .

Is Monkey Island the only game with the issue ?