I was not sure if I should update my server Catscraft.net from 1.6.2 to 1.6.4 because I did not know if I could change back if I wanted to. Then a friend told me that when I log into minecraft that under settings I could change between the too versions I tried it and it worked so if your not sure if you should update or not just give it a try and see for yourself. Please comment how you are liking the update ~ angrylawnngnome :)