Can't recreate that.

It might be driver/GFX specific.

Oh, I should note I run Minecraft with the java argument "-Dforge.forceNoStencil=true". It could be related to the problem.

Sangar uses depth buffer to mask out a region so it shouldn't happen.

What does that argument do?

Disables stencil buffer in MC's rendering.

What @Kubuxu said, it makes Minecraft not crash with certain very old GPUs and old OpenGL versions.

ah ok. OpenGL 2 get any benefits of this?

It makes OpenGL2.1only GPUs work with MC.

There is literally no benefit at all except for old GPUs not crashing.

Uhhhh, that... should be impossible. Great.

What I'm essentially doing is flattening the depth buffer, then punch a hole in it and render in that hole. Anything outside it shouldn't render. This indicates either the GL state gets messed with somewhere, or... or I don't know, honestly.

Well, I am quite sure it's somehow related to this java argument because of the scrolling stuff in CodeChickenCore (Yes, I see this warning in the log because of this java argument).

@Vexatos ChickenBones uses stencil buffer.
Can you post a GL compatibility report? http://sourceforge.net/projects/openglreport/

That. I don't use the stencil buffer. I wanted to, but it seems to be disabled by default, even, so I dropped that idea.

The website wasn't working for me, but I managed to use a different tool and it gave me this: http://pastebin.com/4iAkfnLF

Maybe I should note that taking a screenshot using F2 fixes it until I randomly click links again.

Just to anyone who cares, this is fixed now. Throwing in a GL11.glDisable(GL11.GL_ALPHA_TEST) fixed it.