Minecraft 1.6.3

Mobs visually sinking through solid blocks

Chunks not loading surface, revealing caves, etc.

Ghost boats

Boat inflicts fall damage if it runs aground in some fashion (Slabs, Mobs, Soul Sand)

Stairs in Desert Temple are not facing the right way

Walking on blocks less than 1 block tall placed on ice, slime blocks or honey blocks acts like walking on ice, slime block or honey blocks directly

Dropped items bounce on stairs, cauldrons, carpets and full / locked hoppers

Snow doesn't form / cannot be placed on upside down slabs / stairs

Resizing the Minecraft window while dead grays out the Respawn/Exit to Menu buttons and several other screens

Black (squares?) on 3rd person view

You can see the moon/sun through clouds with solid blocks above them

Mob heads and Pumpkins cannot be equiped by Dispenser / through shift-click

Wrong rendering order of particles, hitboxes, clouds, transparent blocks, breaking animations and various other transparent textures

Comparator in subtraction mode does not update visually under certain conditions

getting a locked chest pushed into your head crashes the game

Baby Zombie Pigman's anger sounds are identical to the adult's anger sounds.

Stone-based blocks mined too quickly by inappropriate enchanted pickaxe

Carpets Are Not Flammable

Redstone ore sometimes failing to deactivate properly.

New AI mobs see through invisibility

Endermen with Fire Resistance Gets Paranoid when it touches lava or fire

Enderman appears passive when it attacks someone

The /playsound command only plays at a fixed point when the command is directed at a player.

Mac OS X: can't write accented letters

Minecraft has advice on an error report that should be deleted.

Damage wobble no longer shows direction of incoming damage

Villagers slow down dramatically when in 'love' mode

The saddle equip sound effect does not play when equipping a pig with a saddle.

Mobs visually sinking through solid blocks

Chunks not loading surface, revealing caves, etc.

Ghost boats

Boat inflicts fall damage if it runs aground in some fashion (Slabs, Mobs, Soul Sand)

Stairs in Desert Temple are not facing the right way

Walking on blocks less than 1 block tall placed on ice, slime blocks or honey blocks acts like walking on ice, slime block or honey blocks directly

Dropped items bounce on stairs, cauldrons, carpets and full / locked hoppers

Snow doesn't form / cannot be placed on upside down slabs / stairs

Resizing the Minecraft window while dead grays out the Respawn/Exit to Menu buttons and several other screens

Black (squares?) on 3rd person view

You can see the moon/sun through clouds with solid blocks above them

Mob heads and Pumpkins cannot be equiped by Dispenser / through shift-click

Wrong rendering order of particles, hitboxes, clouds, transparent blocks, breaking animations and various other transparent textures

Comparator in subtraction mode does not update visually under certain conditions

getting a locked chest pushed into your head crashes the game

Baby Zombie Pigman's anger sounds are identical to the adult's anger sounds.

Stone-based blocks mined too quickly by inappropriate enchanted pickaxe

Carpets Are Not Flammable

Redstone ore sometimes failing to deactivate properly.

New AI mobs see through invisibility

Endermen with Fire Resistance Gets Paranoid when it touches lava or fire

Enderman appears passive when it attacks someone

The /playsound command only plays at a fixed point when the command is directed at a player.

Mac OS X: can't write accented letters

Minecraft has advice on an error report that should be deleted.

Damage wobble no longer shows direction of incoming damage

Villagers slow down dramatically when in 'love' mode

The saddle equip sound effect does not play when equipping a pig with a saddle.