While it is no longer alright to mess with Bio, Rappunk is still fair game.

Try setting the render distance to far.

I don't know why, but the beta seems fucked up like that, something to do with the trees, mang.

Thats normally what it does, but every few updates when Notch changes something about the trees, shit gets fucked and, uh, I don't fucking know how, maybe the coding is fucked up so its loading the tree scripts that are not visible when there is a lot of fog.
I don't know this shit, Notch is a horrible coder.

My guess exactly.

Maybe when on the higher render distances Notch has some protocol shit in place to help keep the game from flipping shits with lagging, but those are turned off when you go to a lower render distance.

Idunolol D: