Minecraft Version: 1.4.4
Operating System: Mac OS X (x86_64) version 10.7.2
java version "1.6.0_37"
Java(TM) SE Runtime Environment (build 1.6.0_37-b06-434-11M3909)
Java HotSpot(TM) 64-Bit Server VM (build 20.12-b01-434, mixed mode)
Steps to reproduce:
1) Start minecraft server with extended memory sizes (java -Xmx1G -Xms1G -jar minecraft_server.jar)
2) Launch client
3) Connect to created game
Player can't move in world: he always returns to the original starting position. Also some chunks of world not loaded.
Log with debug start is attached.
Note: this bug was reproduced after