Minecraft 1.6.0.1 beta works badly

Hey,so I just updated to minecraft beta 1.6.0.1 but I had some issues

First minecraft didn't launch so i redownloded minecraft so it did launch but when I opened a world the world didn't open so I redownloded again this time I was just a floating head so I redownloded the game again but this time I was still a floating head and when I opened a world it didn't open so I wish u fix this really soon if there is a solution send it on my email please Thanks