Problem with Render Targets

Hi everyone
I have been testing something for my multiplayer game project in which I have the players view show up on monitors/screens in-game using the SceneCaptureComponent2d to Render Target method.
All works fine in editor and when I package it to windows 64bit it works on my end but I have sent it to friends (3 friends have tested it) and they all get pixel-like distortion (maybe the skybox too?) appearing when looking at the texture\in-game monitors (see screenshots below).
It happens to them whether they’re host or client but again, all is fine on my end. I’m stumped on this as I’m running the exact same build of my project. Are they missing some kind of third party driver?
Any ideas to solve this is greatly appreciated, let me know if any more info is needed.