I loaded up a new world in 1.8. The chunks weren't loading, so I changed my render distanced to get them to load in. When I did, the chunks loaded, but invisibly! I could see the grass (see screenshots), but I couldn't see the actual chunks. These "invisible chunks" appeared randomly, and when I moved my mouse, they would change from being invisible, being visible, and glitching between visible/invisible. As you can see in some of the screenshots, only some of the blocks were affected. Also, as I flew up, the game got laggier and laggier, almost to the point that I though it would crash, and only a small section of the world was loaded. Thank you for reading this and I hope this is fixed!