There are weird multi-colored lines aroung every item. All you have to do is find an area made completely out of one material (has to be a flat surface). It happens in all gamemodes and it also happens with blocks and items in hand. I updated my LWJGL but that didn't fix the bug. Alot of people have said to turn "Forced Anti-Aliasing" to Application Decides but I have a Mac (with ATI graphics even though I prefer nVidia) and you can't change hardware setting on Macs (only OS-level settings) PLEASE FIX THIS MOJANG!!!!(BTW the mac I am using has a Intel Core 2 Duo (2.8 Ghz))