Java Edition 1.5.1 (pre-release)

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1.5.1 is the first and only pre-release for Java Edition 1.5.1.

General

 * Performance
 * Improved performance.

Fixes
10 bugs fixed

From released versions before 1.5.1
 * – Massive ping issues since 1.3.2.
 * – Trapdoors and pressure plates (and maybe more) cause lighting problems.
 * – FPS drop due to smooth lighting.
 * – After changing texture packs thrown Ender Pearls & Splash potions become other items.
 * – The text of things fall out of the picture.
 * – Invalid potion effects crash the game.
 * – Crash with invalid wool values.
 * – Dispenser/Right click incorrectly puts on armor.

From the 1.5 snapshots
 * – OSX: Crash on startup (OpenGL "Function is not supported").
 * – Hopper beneath furnace doesn't remove empty buckets.

Reupload
The 1.5.1 pre-release was reuploaded on March 20, 2013 to fix a null pointer crash. This reupload then proceeded to be the true release of 1.5.1.