Update - 1.6.2

[Mafios_X]

Bug Fixes:

Fixed new item duplication bug

New Bugs:

The item duplication bug was not actually fixed; items placed in a furnace can still be taken out of a furnace and duplicated infinitely by right-clicking (although it appears the newly duplicated item will not function).
When using a furnace and placing items into it, as soon as it's activated all items minus 1 are ejected and must be placed back in the furnace in order to use it.
Lighting is not always updated when digging new holes/tunnels, placing torches or setting blocks on fire (in both nether & normal world).
Tall grass can grow on dirt with no grass on it.
Shift-clicking something into a full chest from inventory or from chest into full inventory crashes the client.
It is now impossible to row a boat in 1 block deep water.
Sometimes (tested while in a boat on water, and when floating in water) while viewing a map the game will switch to a "saving chunks screen" then end on a black screen.
When quitting game the "Saving Chunks" progress bar does not appear sometimes.
When loading a world and standing in a cave less than 4 blocks high, the player gets some initial damage (at least the damage sound appears).
"Out of memory" error. Often appears after the "blocks don't disappear" bug.

The following bugs only occur in new chunks generated in 1.6.2:

Some chunks don't get dark at night (and vice versa; some chunks stay dark during the day).
The textures don't load on some chunks (The blocks are present but with transparent textures).
Some blocks don't disappear after being broken; it appears as if the block is still there, but can be passed through.