Java Edition 13w18c

13w18b was released to fix some of the bugs and crashes in the 13w18a snapshot.

Changes

 * Block of Coal smelting time was changed from 720 to 800 seconds.
 * Smelts 80 items, like 10 coal

Fixes
7 bugs fixed

From the 1.6.1 snapshots
 * – Enchanted Books don't show what tab it is in
 * – Skins not loading for players
 * – Breaking Item Frames causes a null pointer exception and crash.
 * – Internal exception: java.lang.NullPointerException

From the previous snapshot
 * – Wrong particle texture when changing texture packs in-game
 * – Coal Blocks and Note Blocks do not show up in creative tabs
 * – Game crashes on startup