Player unable to open a command block GUI after running the /kill command

JSON text format does not work when text commands (/title, /tellraw) are ran.

Game crashes on loading 15w35b

Spawned Entities not being detected by @e parameter

Dispensers do not place command blocks when power is applied to them

Testing for a player's rotation using /execute and /testfor to summon an arrow in one direction causes arrows to summon in the ry positive and facing the ry negative rotations.

Wither Skeletons constantly getting light on fire then diffusing in daylight.

Redstone textures are messed up when connected going at an angle or making a turn.

Placing blocks that will replace air next to another solid block drops frame-rate down to 0 and produces lag.

Arrow entities lag when shot from a bow

Using the new VBO feature in the "Video Settings" menu creates chunk generation lag, creates ghost entities of blocks when pulled by a piston or broken and also reduces FPS.

Chunk Generation on a "Redstone Ready" superflat preset creates random areas of default superflat worlds.

Falling sand entity textures not working

When summoning a falling sand entity rendered as a chest, the game crashes.