Black Line Across Background of Most Shaders

With most of the shaders (super secret settings) there is a large black line across the background of the world, in what i assume is described as the sky. Only when above sea level and there is no terrain blocking the sky.

When going through the shaders I expected to be able to see all of them normally, as they should be.

Instead most were correct but included a thick black line across the background.

Steps to Reproduce:
1. Open any minecraft world on the snapshot 14w06a
2. Get above sea level with no blocks blocking the horizon
3. Go through the shaders, most of them do but some don't. for example: 'notch' doesn't but 'fxaa' does