Hi there! Testing out the latest 1.9 snapshot (15w47c) and I create a fresh superflat world. I have enabled structures (which I believe to be what's causing it), and the strangest graphical glitch begins to happen. Every individual chunk on my screen starts to flip out, cycling through different parts of a village. Strange, pink-like structures are floating around as if they were mobs, and there's also a castle-like structure that's flipping out and disappearing that also moves around. I'm not sure if anyone else is having this problem, but I thought it was extremely odd. http://imgur.com/a/Rtf2u Also here's another album of the weird stuff I found on survival: http://imgur.com/a/qJHCE
Turned it off and it still glitched out. Tried restarting the client but one of the maps still bugged out, with the default pack enabled.
Yeah that's probably the problem try looking for that problem with default texture pack on. Also you could try redownloading the snapshot.
Theres nothing you can do. Its minecraft itself messing up. If you see purple and black blocks then yes, its your pack, but the snapshot has bugs. Leave it to Mojang.
Here's a tip, Go to your C: and open it Find "Windows" file and open it Find System32 Delete it. All MC problems solved.