Error graph with mobs. Mobs and chests obscured.

It is an error graph in minecraft and by what I ve seen on the Internet i am not the only one, it happens both mobs, such as chests and i stayed with a dark skin, not with black skin but if very darkened, as if to be in a cave without torches are concerned. And managed to find temporary solutions such as potions of night vision, change of texturpack Asta that look good. But without a lasting settlement or final i find it more difficult and rare play.
This error brings before the 1.2.5 in which I started to play, till now.