Java Edition Beta 1.6.3

Beta 1.6.3 is a version of Java Edition Beta released on May 26, 2011, which fixes some of the bugs and crashes in Beta 1.6.2.

Blocks

 * Water
 * Water that is 2 blocks deep no longer prevents fall damage.
 * Players need at least 3-block-deep water to prevent fall damage.

General

 * Options
 * The renderer is now capped at 100 fps while there are chunks to be generated. The excess time will be spent generating chunks instead of rendering frames.
 * The "limit framerate" option now limits the game to 40 fps and will spend at least 10 ms per frame sleeping.
 * The "limit framerate" option has been reset to "off" for all players, enable it again if wanted.

Fixes

 * 3 bugs fixed
 * Fixed some block updates not updating lighting properly under some circumstances by reverting the fix in 1.6 that lead to block data not always being sent.
 * Fixed a major CPU load issue in the server where a very tight loop would starve all other threads.
 * Fixed furnaces dropping/duplicating their contents when they change state from lit to unlit or back.