World isn't loading and keeps flashing

After I updated to 1.8.4 my game started freaking out, every time I load up and try to play the world is invisible except from flashing blocks, lava, water etc. I don't really know how to explain it but heres a picture of what kinda happens. I've uninstalled and reinstalled it a few times and nothing changes. Just wondering if anyone has had the same problem or even knows how to fix it.