Removing obsidian/portal block from a lit portal crashes the game

Random crash when opening a world

Arrows in 13w16b are buggy

Comparator's front torch texture is wrong when right-clicked

Rapid pulse generator glitch with redstone length/strength.

Splash text in Main Menu changes only if you press "Escape", otherwise it does not

Comparator doesn't recognise whether there are items in a hopper or not (see screenshots).

Trying to gather-up all blocks/items of same kind in creative's survival inventory does not work (using the new function in 1.5).

Comparator doesn't send correct redstone signal.

Taking away the "Nausea" effect with "/effect PLAYER_NAME 9 0" shows awskward stuff.

Item Duplication in Hotbar and in World