Alright so basically entire rows of pixels are flashing, white in colour. Best way I can describe it. (It's only while in game, my screen is not broken) Any idea why that might be? It's very annoying. I got a headache from it.
Few suggestions that might help your problem; - Reinstalling the game, in case you were WZ. editing or some sort that might caused the problem or files that got deleted due to unknown reason. for example if your pc crashed. - Updating your graphics card, MS is an old game that don't require high-tech pc but sometimes there are updates that might fix previous update mistakes or common miss-coded behaviors. Try to provide a screenshot and your PC spec details, so I could see what the issue is really is.