shaders in super secret settings causes black bar to appear over horizon (SMP)

when using super secret setting to enable anti-aliasing shaders, it causes a Black bar to to appear across the horizon.

*What I expected to happen was...:same ol' cool shaders

*What actually happened was...: black bar on anti-aliased shaders when looking at horizon

Steps to Reproduce:
1. start mc smp
2. hit esc
3. hit options
4. hit super secret settings twice
5. enjoy black bar on horizon