Hello, I have recently found the new minecraft 1.3.1 to be more buggy than said to be?
Some of the things are:
When i make a world only part of it spawns the rest of the chunks will not spawn?
When i save and quit,then go back into the world its completely gone ?!
Every time i put in a seed its the same even when its a different seed?
There are a TON of lighting errors and its more laggy than 1.2.5 (I know they added an internal server to singleplayer!)

If you have answers to any of these please give them!