when trying to use the new snapshot launcher, for mac on my mac computer, the launcher either says "logging in" for 20 minutes, or end with "game ended with bad state (exit code 139)

when i launch up the new launcher curently in progress, it ends with
Client> 249 recipes
Client> 27 acheivments
Client> 2013-04-26 16:55:37 [CLIENT] [INFO] setting user: APRPLWLFY
Client> 2013-04-26 16:55:37 [CLIENT] [INFO] (Session ID is 8264634051945873090)
Client> Invalid memory access of location 0x0 rip=0x0
Client>
Game ended with bad state (exit code 139)