Board Thread:Bug Reports/@comment-25612015-20151231124220/@comment-27723099-20151231160650

Ah, this value is exactly the max Double value in Java. Generally there should be no problems with players outside the world bounds (you can test that with the teleport command) but this number is so high, that you had to move a huge distance to move at all. A difference of a few blocks would make no difference in the value. Maybe this leads to endless loops where the game tries to move the player without effect.

After a breif search, I couldn't find any usage of Double.MAX_VALUE in the mod code, so I suspect it's a missing or malformatted value that is set to a default of MAX_VALUE by another part of the game.