I installed the new native OSX Launcher for Minecraft. The first time it is started, everything works fine. All subsequent attempts to start minecraft fail, the launcher hangs with a blank screen on startup, and has to be force-quit. If I delete ~/Library/Application Support/minecraft/launcher.jar, I can start minecraft once. It downloads a new launcher.jar, and the next time I try to start Minecraft, the launcher hangs.

I have deleted everything, and started fresh, and this is reproduceable. the logs show no differences. in fact I have diffed entire folders. and the only changes are the existence of a launcher.jar when minecraft fails to start, and the log from minecraftUpdater when it retrieves a launcher.jar but starts minecraft.

I have attached a screenshot of the hang, and the apple crash log from when I force-quit.

Note that as soon as I generated this data, I performed an: 'rm ~/Library/Application\ Support/minecraft/launcher.jar' from the command line, and was immediately able to start minecraft, but only one time.