Hello i have created a survival world and when i went to make a nether portal i went into it and it crashed my game. I tried on pre release 2 for today and it still happened. I tried making a new world in creative to try and it still crashed my game.
Environment
http://prntscr.com/suk091 , Java version Pre-release 1 and 2.
Worlds generated in Prerelease 1 are broken beyond repair, see MC-187408.