Okay, so I was in the process of finishing this Soccer map i made, and then every object started spazzing out, flickering on and off with lights. It only happens when I'm in a certain area looking a certain direction. here's the video. Light Show I heard this happened to one of my friends also, but when I changed to a projector, it didn't flicker with lights as much, so it may just be my screen. Try it out.
Happens with all sandbox maps when they get high on the item limit. Blockout is very hard to work with because it disco balls unless you look down at a few pieces.