Minecraft wiki entry for Development_versions, associated text: Fixed smoke/water particles flying off at crazy speeds.
Hostile creatures can again hit with melee attacks against mounted players.
Fixed a crash when downloading texture packs from the Global Resources or Resource Packs tab.
Fixed a crash that could occur when trying to access XBL.
Hitting an Enderman with a potion of Invisibility no longer also makes the block it is holding disappear.