If you can't load old worlds since the water update, or the worlds are messed up, please try this: Go to main menu, open console (key ~ or `) and type "resetworld worldname" (without quot. marks, e.g. "resetworld New World" [if your world is called "New World"]).
Now try to load the world, and usually a conversion process should start. Once it's ready, you should be able to play the world without any problems.
To do the same procedure in Multiplayer, you can shutdown the server, open the "server.properties" file with a texteditor and add the key "resetworld=worldname". Save the file, and start the server, now the world should be converted.
Important: Do not misuse this command. If you apply it to a world which has been created after the water update, you may eventually break it.
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Other issues: Currently there is a problem with Linux and 32 Bit Windows. We are still working on a solution, eventually it may take a few hours until these issues are sorted out. We are sorry for the inconvenience.
