World Disappearing and End is still complete

Pushing a door with a piston breaks it

Oversized texture in default texture pack.

Pick-Blocking any color banner will give a black banner

Spawners (Dungeons, Strongholds, etc...) can spawn mobs outside of worldborder

Extreme Lag in 14w20b - Survival mode only! I was playing in my survival world then I got extreme lag, not sure why, but more info in the desc.

When you look through glass pane at a west or east angle, the edge of the glass is not transparent.