So I created a new map, a 1.3 map, for my server. I loaded it, however, we use a plugin called my worlds, and we have multiple worlds. Whenever anyone goes to the 1.3 map, they fall into the void. Even if they relog, they continue to fall, and the entire server lags-- EXCEPT for the chat. The chat does not lag, only commands and chunk loading. I've tried removing and unloading other maps, but still, the problem persists. I am on the latest recommended build (this problem existed before on the dev builds, and even the first recommended build). Halp please. :[ EDIT by Moderator: merged posts, please use the edit button instead of double posting.