When I'm running the World of Minecraft client, alot of the block textures are alot different from the original, and alot of them are full of holes that shouldnt be there. Like the White Block texture looks more like a piece of cloth, and when I look at it, I can see through it, and through everything -behind- it too. Same goes for the vines, the clear space is mostly filled in with yellow blotches.

Anyone have any idea on how to fix this?