I would love to use this Pack but for some reason it ... well, let's say it changes my game in a way i never saw or even heard of.
See for yourself:
No Mods. Only Optifine and a shader. (Same thing happens when removing them)
Edit: Ok turns out i have to turn off AA in the shader options (even without using a shader) to have the world normal again. But its still strange that it happens only with the L&T pack..